* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            -webkit-tap-highlight-color: transparent;
        }

        :root {
            --primary: #14B8A6;
            --primary-light: #2DD4BF;
            --primary-dark: #0F766E;
            --accent: #FBBF24;
            --bg: #0F172A;
            --bg-card: #1E293B;
            --bg-input: #334155;
            --text: #F1F5F9;
            --text-muted: #94A3B8;
            --border: #475569;
            --success: #10B981;
            --warning: #F59E0B;
            --danger: #EF4444;
            --gradient-1: linear-gradient(135deg, #14B8A6, #FDE68A);
            --safe-bottom: env(safe-area-inset-bottom, 0px);
        }

        [data-theme="light"] {
            --primary: #0D9488;
            --primary-light: #14B8A6;
            --primary-dark: #0F766E;
            --accent: #D97706;
            --bg: #F8FAFC;
            --bg-card: #FFFFFF;
            --bg-input: #F1F5F9;
            --text: #1E293B;
            --text-muted: #64748B;
            --border: #CBD5E1;
            --success: #059669;
            --warning: #D97706;
            --danger: #DC2626;
            --gradient-1: linear-gradient(135deg, #14B8A6, #FDE68A);
        }

        html, body {
            height: 100%;
            overflow: hidden;
        }

        body {
            font-family: 'Plus Jakarta Sans', 'Inter', sans-serif;
            background: var(--bg);
            color: var(--text);
            display: flex;
            justify-content: center;
            transition: background 0.3s ease, color 0.3s ease;
        }

        /* Animated background */
        .bg-animation {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            z-index: 0;
            overflow: hidden;
            pointer-events: none;
        }

        .bg-animation .orb {
            position: absolute;
            border-radius: 50%;
            filter: blur(80px);
            opacity: 0.12;
            animation: float 20s infinite ease-in-out;
        }

        [data-theme="light"] .bg-animation .orb {
            opacity: 0.08;
        }

        .bg-animation .orb:nth-child(1) {
            width: 500px;
            height: 500px;
            background: var(--primary);
            top: -150px;
            left: -100px;
        }

        .bg-animation .orb:nth-child(2) {
            width: 400px;
            height: 400px;
            background: var(--accent);
            bottom: -120px;
            right: -80px;
            animation-delay: -7s;
        }

        .bg-animation .orb:nth-child(3) {
            width: 350px;
            height: 350px;
            background: #FDE68A;
            top: 40%;
            left: 60%;
            animation-delay: -14s;
        }

        @keyframes float {
            0%, 100% { transform: translate(0, 0) scale(1); }
            25% { transform: translate(50px, -50px) scale(1.1); }
            50% { transform: translate(-30px, 30px) scale(0.95); }
            75% { transform: translate(40px, 20px) scale(1.05); }
        }

        /* App Shell */
        #app {
            position: relative;
            z-index: 1;
            width: 100%;
            max-width: 480px;
            height: 100%;
            display: flex;
            flex-direction: column;
            background: var(--bg);
            box-shadow: 0 0 40px rgba(0,0,0,0.5);
            transition: background 0.3s ease;
        }

        [data-theme="light"] #app {
            box-shadow: 0 0 40px rgba(0,0,0,0.12);
        }

        @media (min-width: 520px) {
            #app {
                height: 95vh;
                margin-top: 2.5vh;
                border-radius: 24px;
                overflow: hidden;
                border: 1px solid var(--border);
            }
        }

        /* Header */
        .app-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 14px 16px;
            padding-top: calc(14px + env(safe-area-inset-top, 0px));
            background: rgba(15, 23, 42, 0.85);
            backdrop-filter: blur(20px);
            border-bottom: 1px solid rgba(71, 85, 105, 0.5);
            flex-shrink: 0;
            z-index: 95;
        }

        [data-theme="light"] .app-header {
            background: rgba(255, 255, 255, 0.9);
            border-bottom: 1px solid rgba(203, 213, 225, 0.8);
        }

        .header-left {
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .menu-btn {
            margin-right: 2px;
        }

        .logo-icon-small {
            width: 38px;
            height: 38px;
            background: var(--gradient-1);
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 18px;
            box-shadow: 0 4px 12px rgba(20, 184, 166, 0.35);
        }

        [data-theme="light"] .logo-icon-small {
            box-shadow: 0 4px 12px rgba(13, 148, 136, 0.25);
        }

        .header-title h1 {
            font-size: 1rem;
            font-weight: 800;
            background: var(--gradient-1);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            line-height: 1.2;
        }

        [data-theme="light"] .header-title h1 {
            background: var(--gradient-1);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .header-title span {
            font-size: 0.7rem;
            color: var(--text-muted);
            display: block;
        }

        .header-actions {
            display: flex;
            gap: 8px;
        }

        .icon-btn {
            width: 40px;
            height: 40px;
            border-radius: 12px;
            border: 1px solid var(--border);
            background: var(--bg-card);
            color: var(--text);
            font-size: 1rem;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            transition: all 0.2s ease;
        }

        [data-theme="light"] .icon-btn {
            background: #FFFFFF;
        }

        .icon-btn:active {
            transform: scale(0.92);
            background: var(--primary);
            border-color: var(--primary);
            color: #fff;
        }

        /* Main Content */
        .main-content {
            flex: 1;
            overflow-y: auto;
            overflow-x: hidden;
            padding: 16px;
            padding-bottom: calc(20px + var(--safe-bottom));
            scroll-behavior: smooth;
        }

        .main-content::-webkit-scrollbar {
            width: 4px;
        }

        .main-content::-webkit-scrollbar-thumb {
            background: var(--border);
            border-radius: 2px;
        }

        .tab-panel {
            display: none;
        }

        .tab-panel.active {
            display: block;
            animation: fadeIn 0.3s ease;
        }

        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(8px); }
            to { opacity: 1; transform: translateY(0); }
        }

        /* Cards */
        .card {
            background: var(--bg-card);
            border-radius: 20px;
            padding: 20px;
            border: 1px solid var(--border);
            margin-bottom: 16px;
            transition: background 0.3s ease, border-color 0.3s ease;
        }

        [data-theme="light"] .card {
            background: #FFFFFF;
            box-shadow: 0 1px 6px rgba(0,0,0,0.06);
        }

        .input-card {
            padding-bottom: 16px;
        }

        .card-title {
            font-size: 1.1rem;
            font-weight: 700;
            margin-bottom: 6px;
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .card-subtitle {
            font-size: 0.8rem;
            color: var(--text-muted);
            margin-bottom: 18px;
        }

        /* Form Elements */
        .form-group {
            margin-bottom: 16px;
        }

        .form-group label {
            display: block;
            font-size: 0.75rem;
            font-weight: 700;
            color: var(--text-muted);
            margin-bottom: 6px;
            text-transform: uppercase;
            letter-spacing: 0.5px;
        }

        .form-group input,
        .form-group select,
        .form-group textarea {
            width: 100%;
            padding: 12px 14px;
            background: var(--bg-input);
            border: 1px solid var(--border);
            border-radius: 12px;
            color: var(--text);
            font-family: inherit;
            font-size: 0.9rem;
            outline: none;
            transition: all 0.2s ease;
        }

        [data-theme="light"] .form-group input,
        [data-theme="light"] .form-group select,
        [data-theme="light"] .form-group textarea {
            background: #F8FAFC;
            color: #1E293B;
        }

        [data-theme="light"] .form-row select option {
            background: #FFFFFF;
            color: #1E293B;
        }

        .form-group input:focus,
        .form-group select:focus,
        .form-group textarea:focus {
            border-color: var(--primary-light);
            box-shadow: 0 0 0 3px rgba(20, 184, 166, 0.2);
        }

        .form-group textarea {
            resize: vertical;
            min-height: 90px;
        }

        .input-wrapper {
            position: relative;
            display: flex;
            align-items: stretch;
        }

        .input-wrapper input,
        .input-wrapper textarea {
            padding-right: 42px;
        }

        .input-btn {
            position: absolute;
            top: 50%;
            transform: translateY(-50%);
            right: 10px;
            background: transparent;
            border: none;
            color: var(--text-muted);
            cursor: pointer;
            padding: 6px;
            font-size: 0.85rem;
            border-radius: 6px;
            transition: all 0.2s ease;
            line-height: 1;
            z-index: 2;
        }

        .input-wrapper textarea ~ .input-btn {
            top: 12px;
            transform: none;
        }

        .input-btn:active {
            color: var(--text);
            background: rgba(128,128,128,0.15);
        }

        .form-row {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 12px;
        }

        .select-wrapper {
            position: relative;
            display: flex;
            align-items: center;
        }

        .select-wrapper select {
            width: 100%;
            padding-right: 36px;
            -webkit-appearance: none;
            -moz-appearance: none;
            appearance: none;
            background-image: none !important;
        }

        .select-wrapper select::-ms-expand {
            display: none;
        }

        .select-arrow {
            position: absolute;
            right: 12px;
            top: 50%;
            transform: translateY(-50%);
            font-size: 0.75rem;
            color: var(--text-muted);
            pointer-events: none;
            line-height: 1;
        }

        [data-theme="light"] .select-arrow {
            color: #64748B;
        }

        /* Collapsible */
        .collapsible {
            background: rgba(51, 65, 85, 0.5);
            border-radius: 14px;
            border: 1px solid var(--border);
            margin-bottom: 16px;
            overflow: hidden;
        }

        [data-theme="light"] .collapsible {
            background: rgba(241, 245, 249, 0.8);
        }

        .collapsible-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 14px 16px;
            cursor: pointer;
            font-weight: 700;
            font-size: 0.9rem;
            color: var(--text);
            user-select: none;
        }

        .collapsible-header i {
            transition: transform 0.3s ease;
            color: var(--text-muted);
            font-size: 0.85rem;
        }

        .collapsible.open .collapsible-header i {
            transform: rotate(180deg);
        }

        .collapsible-body {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease;
            padding: 0 16px;
        }

        .collapsible.open .collapsible-body {
            max-height: 1200px;
            padding: 0 16px 16px;
        }

        /* Generate Button */
        .generate-btn {
            width: 100%;
            padding: 16px;
            background: transparent;
            border: none;
            border-radius: 14px;
            color: white;
            font-family: inherit;
            font-size: 1rem;
            font-weight: 700;
            cursor: pointer;
            transition: all 0.2s ease;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 10px;
            position: relative;
            overflow: visible;
            box-shadow: 0 4px 20px rgba(20, 184, 166, 0.4);
            z-index: 1;
            isolation: isolate;
        }

        /* Magenta-purple-blue-cyan-white animated sweeping border ring */
        .generate-btn::before {
            content: "";
            position: absolute;
            inset: -5px;
            border-radius: 19px;
            background: linear-gradient(
                90deg,
                rgba(255, 0, 255, 0.9) 35%,
                white 45%,
                rgba(128, 0, 255, 0.9) 5%,
                rgba(0, 0, 255, 0.95) 55%,
                rgba(128, 0, 255, 0.9) 15%,
                cyan 70%,
                rgba(255, 0, 255, 0.9) 35%
            );
            background-size: 300% 100%;
            z-index: -2;
            opacity: 0;
            transition: opacity 0.25s ease;
            pointer-events: none;
            filter: blur(3px);
        }

        .generate-btn.generating::before,
        .generate-btn:active::before {
            opacity: 1;
            animation: sweepBorder 1.6s linear infinite;
        }

        /* Sweeping box-shadow glow layer */
        .generate-btn .glow-layer {
            position: absolute;
            inset: -8px;
            border-radius: 22px;
            pointer-events: none;
            z-index: -3;
            opacity: 0;
            transition: opacity 0.25s ease;
            background: linear-gradient(
                90deg,
                rgba(255, 0, 255, 0.9) 35%,
                white 45%,
                rgba(128, 0, 255, 0.9) 5%,
                rgba(0, 0, 255, 0.95) 55%,
                rgba(128, 0, 255, 0.9) 15%,
                cyan 70%,
                rgba(255, 0, 255, 0.9) 35%
            );
            background-size: 300% 100%;
            filter: blur(14px);
        }

        .generate-btn.generating .glow-layer,
        .generate-btn:active .glow-layer {
            opacity: 0.85;
            animation: sweepGlow 1.6s linear infinite;
        }

        @keyframes sweepBorder {
            0% { background-position: 100% 50%; }
            100% { background-position: 0% 50%; }
        }

        @keyframes sweepGlow {
            0% { background-position: 100% 50%; }
            100% { background-position: 0% 50%; }
        }

        /* Inner mask to create ring effect */
        .generate-btn::after {
            content: "";
            position: absolute;
            inset: 0;
            border-radius: 14px;
            background: var(--gradient-1);
            z-index: -1;
        }

        .generate-btn:active {
            transform: scale(0.98);
            box-shadow: 0 2px 12px rgba(245, 158, 11, 0.3);
        }

        .generate-btn:disabled {
            opacity: 0.85;
            cursor: not-allowed;
            transform: none;
        }

        [data-theme="light"] .generate-btn {
            box-shadow: 0 4px 16px rgba(13, 148, 136, 0.35);
        }

        .gradient-text {
            background: linear-gradient(135deg, magenta, blue);
            -webkit-background-clip: text;
             background-clip: text;
            -webkit-text-fill-color: transparent;
             color: transparent; /* fallback untuk browser lama */
        }
        
        /* Quick Templates Strip */
        .quick-templates {
            margin-bottom: 16px;
        }

        .section-title {
            font-size: 0.85rem;
            font-weight: 700;
            color: var(--text-muted);
            margin-bottom: 10px;
            text-transform: uppercase;
            letter-spacing: 0.5px;
            padding-left: 4px;
        }

        .templates-strip {
            display: flex;
            gap: 10px;
            overflow-x: auto;
            padding: 4px;
            scroll-snap-type: x mandatory;
            -webkit-overflow-scrolling: touch;
        }

        .templates-strip::-webkit-scrollbar {
            display: none;
        }

        .templates-dots {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 8px;
    margin-top: 12px;
    padding: 4px 0;
    min-height: 14px;
}

.template-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--border);
    opacity: 0.6;
    transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
    flex-shrink: 0;
    pointer-events: none;
}

.template-dot.active {
    width: 18px;
    height: 8px;
    border-radius: 5px;
    background: linear-gradient(90deg, #14B8A6, #2DD4BF);
    opacity: 1;
   /* box-shadow: 0 0 12px rgba(45, 212, 191, 0.65);*/
    transform: scale(1.08);
}

        .template-chip {
            flex-shrink: 0;
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: 14px;
            padding: 12px 16px;
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--text);
            cursor: pointer;
            display: flex;
            align-items: center;
            gap: 8px;
            scroll-snap-align: start;
            transition: all 0.2s ease;
        }

        [data-theme="light"] .template-chip {
            background: #FFFFFF;
            box-shadow: 0 1px 4px rgba(0,0,0,0.06);
        }

        .template-chip:active {
            background: var(--primary);
            border-color: var(--primary);
            color: #fff;
            transform: scale(0.95);
        }

        /* Output Section */
        .output-placeholder {
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            padding: 50px 20px;
            text-align: center;
        }

        .output-placeholder .icon {
            font-size: 56px;
            margin-bottom: 14px;
            opacity: 0.5;
        }

        [data-theme="light"] .output-placeholder .icon {
            opacity: 0.7;
        }

        .output-placeholder p {
            color: var(--text-muted);
            font-size: 0.9rem;
        }

        .email-output {
            display: none;
        }

        .email-output.visible {
            display: block;
            animation: fadeIn 0.4s ease;
        }

        .email-header {
            background: var(--bg-input);
            border-radius: 12px;
            padding: 14px;
            margin-bottom: 14px;
        }

        [data-theme="light"] .email-header {
            background: #F8FAFC;
        }

        .email-header-row {
            display: flex;
            gap: 8px;
            margin-bottom: 6px;
            font-size: 0.8rem;
        }

        .email-header-row:last-child {
            margin-bottom: 0;
        }

        .email-header-label {
            color: var(--text-muted);
            font-weight: 700;
            min-width: 55px;
        }

        .email-header-value {
            color: var(--text);
            font-weight: 500;
        }

        /* Image Upload */
        .image-upload-area {
            display: flex;
            flex-direction: column;
            gap: 10px;
            margin-bottom: 12px;
            padding: 12px;
            background: var(--bg-input);
            border-radius: 12px;
            border: 1px dashed var(--border);
        }

        [data-theme="light"] .image-upload-area {
            background: #F8FAFC;
        }

        .image-upload-btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 10px 18px;
            background: var(--primary);
            color: white;
            border-radius: 10px;
            cursor: pointer;
            font-size: 0.85rem;
            font-weight: 600;
            font-family: inherit;
            border: none;
            transition: all 0.2s ease;
            width: fit-content;
        }

        .image-upload-btn.large {
            width: 100%;
            padding: 18px;
            font-size: 1rem;
        }

        .image-upload-btn:active {
            background: var(--primary-dark);
            transform: scale(0.98);
        }

        /* Google Drive Link */
        .drive-link-area {
            display: flex;
            flex-direction: column;
            gap: 8px;
            margin-bottom: 12px;
            padding: 14px;
            background: rgba(20, 184, 166, 0.08);
            border-radius: 12px;
            border: 1px dashed rgba(20, 184, 166, 0.4);
        }

        [data-theme="light"] .drive-link-area {
            background: rgba(20, 184, 166, 0.06);
        }

        .drive-link-label {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 0.8rem;
            font-weight: 700;
            color: #14B8A6;
        }

        .drive-link-label i {
            font-size: 1.1rem;
            color: #14B8A6;
        }

        .drive-link-input-wrapper {
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .drive-link-input-wrapper input {
            flex: 1;
            padding: 10px 12px;
            background: var(--bg-input);
            border: 1px solid var(--border);
            border-radius: 10px;
            color: var(--text);
            font-family: inherit;
            font-size: 0.85rem;
            outline: none;
        }

        [data-theme="light"] .drive-link-input-wrapper input {
            background: #F8FAFC;
        }

        .drive-link-input-wrapper input:focus {
            border-color: #14B8A6;
            box-shadow: 0 0 0 3px rgba(20, 184, 166, 0.2);
        }

        .drive-link-btn {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 6px;
            padding: 10px 14px;
            background: #14B8A6;
            border: none;
            border-radius: 10px;
            color: white;
            font-family: inherit;
            font-size: 0.8rem;
            font-weight: 700;
            cursor: pointer;
            transition: all 0.2s ease;
            flex-shrink: 0;
        }

        .drive-link-btn.icon-only {
            width: 44px;
            height: 44px;
            padding: 0;
            border-radius: 50%;
            font-size: 1.3rem;
            background: linear-gradient(135deg, #14B8A6, #0F766E);
            box-shadow: 0 4px 12px rgba(20, 184, 166, 0.4);
        }

        .drive-link-btn.remove {
            background: linear-gradient(135deg, #EF4444, #DC2626);
            box-shadow: 0 4px 12px rgba(239, 68, 68, 0.4);
        }

        .drive-link-btn.remove:active {
            background: linear-gradient(135deg, #DC2626, #B91C1C);
            box-shadow: 0 2px 8px rgba(239, 68, 68, 0.3);
        }

        .drive-link-btn:active {
            background: #0F766E;
            transform: scale(0.96);
        }

        .drive-link-btn.icon-only:not(.remove):active {
            background: linear-gradient(135deg, #0F766E, #115E59);
            box-shadow: 0 2px 8px rgba(20, 184, 166, 0.3);
        }

        .drive-link-wrapper {
            position: relative;
            display: flex;
            flex-direction: column;
            gap: 6px;
            margin: 8px 0;
        }

        .drive-link-label-text {
            font-size: 0.8rem;
            font-weight: 700;
            color: #14B8A6;
            padding-left: 2px;
        }

        .drive-link-row {
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .drive-link-preview {
            flex: 1;
            display: flex;
            align-items: center;
            gap: 10px;
            padding: 10px;
            background: rgba(20, 184, 166, 0.1);
            border: 1px solid rgba(20, 184, 166, 0.25);
            border-radius: 10px;
            min-width: 0;
        }

        .drive-link-preview i {
            color: #14B8A6;
            font-size: 1.1rem;
            flex-shrink: 0;
        }

        .drive-link-preview a {
            color: #14B8A6;
            font-size: 0.85rem;
            text-decoration: none;
            flex: 1;
            min-width: 0;
            overflow: hidden;
            text-overflow: ellipsis;
            white-space: nowrap;
        }

        .drive-link-preview a:hover {
            text-decoration: underline;
        }

        .remove-drive-link {
            flex-shrink: 0;
            width: 32px;
            height: 32px;
            background: rgba(239, 68, 68, 0.15);
            border: 1px solid rgba(239, 68, 68, 0.3);
            color: var(--danger);
            font-size: 0.85rem;
            cursor: pointer;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            transition: all 0.2s ease;
        }

        .remove-drive-link:active {
            background: var(--danger);
            color: white;
            transform: scale(0.92);
        }

        .image-preview-list {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
        }

        .image-preview-item {
            position: relative;
            width: 72px;
            height: 72px;
            border-radius: 8px;
            overflow: hidden;
            border: 1px solid var(--border);
            flex-shrink: 0;
        }

        .image-preview-item img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .image-preview-item .remove-img-btn {
            position: absolute;
            top: 2px;
            right: 2px;
            width: 20px;
            height: 20px;
            background: rgba(0,0,0,0.7);
            color: white;
            border: none;
            border-radius: 50%;
            font-size: 10px;
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        /* Email Body */
        .email-body {
            background: var(--bg-input);
            border-radius: 12px;
            padding: 18px;
            white-space: pre-wrap;
            line-height: 1.7;
            font-size: 0.92rem;
            color: var(--text);
            width: 100%;
            min-height: 180px;
            border: 2px solid transparent;
            font-family: inherit;
            outline: none;
            transition: border-color 0.2s ease;
            overflow-y: auto;
            word-wrap: break-word;
        }

        [data-theme="light"] .email-body {
            background: #F8FAFC;
        }

        .email-body img {
            max-width: 100%;
            height: auto;
            border-radius: 8px;
            margin: 8px 0;
            display: block;
        }

        .email-body:focus,
        .email-body.editable {
            border-color: var(--primary-light);
        }

        /* Action Grid */
        .action-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 10px;
            margin-top: 14px;
        }

        .action-btn {
            padding: 12px 6px;
            border-radius: 12px;
            border: 1px solid var(--border);
            background: var(--bg-input);
            color: var(--text);
            font-family: inherit;
            font-size: 0.75rem;
            font-weight: 700;
            cursor: pointer;
            transition: all 0.2s ease;
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 6px;
        }

        [data-theme="light"] .action-btn {
            background: #F8FAFC;
        }

        .action-btn i {
            font-size: 1.1rem;
        }

        .action-btn:active {
            background: var(--primary);
            border-color: var(--primary);
            color: #fff;
            transform: scale(0.95);
        }

        .action-btn.copied {
            background: var(--success);
            border-color: var(--success);
            color: #fff;
        }

        .action-btn.editing {
            background: var(--success);
            border-color: var(--success);
            color: #fff;
        }

        .action-btn.delete-btn:active {
            background: var(--danger);
            border-color: var(--danger);
        }

        /* Bottom Navigation */
        .bottom-nav {
            position: sticky;
            bottom: 0;
            left: 0;
            right: 0;
            display: flex;
            justify-content: space-around;
            align-items: center;
            background: rgba(15, 23, 42, 0.95);
            backdrop-filter: blur(20px);
            border-top: 1px solid rgba(71, 85, 105, 0.5);
            padding: 8px 0;
            padding-bottom: calc(8px + var(--safe-bottom));
            z-index: 100;
            flex-shrink: 0;
        }

        [data-theme="light"] .bottom-nav {
            background: rgba(255, 255, 255, 0.95);
            border-top: 1px solid rgba(203, 213, 225, 0.8);
        }

        .nav-item {
            flex: 1;
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 4px;
            padding: 6px 4px;
            background: transparent;
            border: none;
            color: var(--text-muted);
            font-family: inherit;
            font-size: 0.65rem;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.2s ease;
            text-decoration: none;
            -webkit-tap-highlight-color: transparent;
        }

        [data-theme="light"] .nav-item {
            color: #64748B;
        }

        [data-theme="light"] .nav-item.active {
            color: var(--primary);
        }

        .nav-item i {
            font-size: 1.25rem;
        }

        .nav-item.active {
            color: var(--accent);
        }

        .nav-item:active {
            color: var(--accent);
            transform: scale(0.92);
        }

        [data-theme="light"] .nav-item:active {
            color: var(--accent);
        }

        /* Bottom Sheets */
        .sheet-overlay {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.6);
            opacity: 0;
            visibility: hidden;
            transition: all 0.3s ease;
            z-index: 200;
        }

        .sheet-overlay.show {
            opacity: 1;
            visibility: visible;
        }

        .bottom-sheet {
            position: fixed;
            left: 50%;
            bottom: 0;
            width: 100%;
            max-width: 480px;
            max-height: 85vh;
            background: var(--bg-card);
            border-radius: 24px 24px 0 0;
            border-top: 1px solid var(--border);
            transform: translate(-50%, 100%);
            transition: transform 0.35s cubic-bezier(0.16, 1, 0.3, 1);
            z-index: 201;
            display: flex;
            flex-direction: column;
            padding-bottom: calc(20px + var(--safe-bottom));
        }

        [data-theme="light"] .bottom-sheet {
            background: #FFFFFF;
        }

        .bottom-sheet.show {
            transform: translate(-50%, 0);
        }

        .sheet-header {
            position: relative;
            padding: 16px 20px;
            text-align: center;
            border-bottom: 1px solid var(--border);
            flex-shrink: 0;
        }

        .sheet-handle {
            width: 40px;
            height: 4px;
            background: var(--border);
            border-radius: 2px;
            margin: 0 auto 12px;
        }

        [data-theme="light"] .sheet-handle {
            background: #CBD5E1;
        }

        .sheet-header h3 {
            font-size: 1rem;
            font-weight: 700;
            color: var(--text);
        }

        .sheet-close {
            position: absolute;
            right: 16px;
            top: 50%;
            transform: translateY(-50%);
            width: 32px;
            height: 32px;
            border-radius: 50%;
            border: none;
            background: var(--bg-input);
            color: var(--text);
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        [data-theme="light"] .sheet-close {
            background: #F1F5F9;
        }

        .sheet-body {
            padding: 20px;
            overflow-y: auto;
            flex: 1;
        }

        /* Templates Grid in Sheet */
        .templates-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 12px;
        }

        .template-card {
            background: var(--bg-input);
            border: 1px solid var(--border);
            border-radius: 16px;
            padding: 18px 12px;
            cursor: pointer;
            transition: all 0.2s ease;
            text-align: center;
        }

        [data-theme="light"] .template-card {
            background: #F8FAFC;
        }

        .template-card:active {
            background: var(--primary);
            border-color: var(--primary);
            color: #fff;
            transform: scale(0.96);
        }

        .template-card .emoji {
            font-size: 32px;
            margin-bottom: 8px;
        }

        .template-card .name {
            font-size: 0.8rem;
            font-weight: 700;
            color: var(--text);
        }

        /* Gmail Options */
        .gmail-options {
            display: flex;
            flex-direction: column;
            gap: 10px;
        }

        .gmail-option {
            display: flex;
            align-items: center;
            gap: 14px;
            padding: 16px;
            background: var(--bg-input);
            border: 1px solid var(--border);
            border-radius: 14px;
            color: var(--text);
            font-family: inherit;
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            text-decoration: none;
            text-align: left;
        }

        [data-theme="light"] .gmail-option {
            background: #F8FAFC;
        }

        .gmail-option i {
            font-size: 1.4rem;
            width: 28px;
            text-align: center;
            color: var(--accent);
        }

        .gmail-option span {
            flex: 1;
        }

        .gmail-option:active {
            background: var(--primary);
            border-color: var(--primary);
            color: #fff;
        }

        .gmail-option:active i {
            color: #fff;
        }

        /* Language Options */
        .language-options {
            display: flex;
            flex-direction: column;
            gap: 10px;
        }

        .language-option {
            display: flex;
            align-items: center;
            gap: 14px;
            padding: 16px;
            background: var(--bg-input);
            border: 1px solid var(--border);
            border-radius: 14px;
            color: var(--text);
            font-family: inherit;
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            text-align: left;
        }

        [data-theme="light"] .language-option {
            background: #F8FAFC;
        }

        .language-option span:first-child {
            font-size: 1.4rem;
        }

        .language-option span:nth-child(2) {
            flex: 1;
        }

        .language-option .fa-check {
            color: var(--success);
            opacity: 0;
        }

        .language-option .fa-check.show {
            opacity: 1;
        }

        .language-option:active {
            background: var(--primary);
            border-color: var(--primary);
            color: #fff;
        }

        /* History */
        .history-item {
            background: var(--bg-input);
            border: 1px solid var(--border);
            border-radius: 14px;
            padding: 14px 16px;
            margin-bottom: 10px;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        [data-theme="light"] .history-item {
            background: #F8FAFC;
        }

        .history-item:active {
            border-color: var(--accent);
            background: rgba(245, 158, 11, 0.15);
            color: var(--text);
        }

        .history-item-subject {
            font-weight: 700;
            font-size: 0.9rem;
            margin-bottom: 4px;
        }

        .history-item-meta {
            font-size: 0.75rem;
            color: var(--text-muted);
            display: flex;
            align-items: center;
            flex-wrap: wrap;
            gap: 6px;
        }

        .history-item-model {
            font-size: 0.65rem;
            padding: 2px 6px;
            background: rgba(20, 184, 166, 0.15);
            color: var(--primary-light);
            border-radius: 4px;
            font-weight: 700;
        }

        .history-delete-btn {
            background: transparent;
            border: none;
            color: var(--text-muted);
            font-size: 1rem;
            cursor: pointer;
            padding: 8px;
            border-radius: 8px;
        }

        [data-theme="light"] .history-delete-btn {
            background: #E2E8F0;
        }

        .history-delete-btn:active {
            background: rgba(239, 68, 68, 0.2);
            color: var(--danger);
        }

        .empty-history {
            text-align: center;
            padding: 40px 20px;
            color: var(--text-muted);
            font-size: 0.9rem;
        }

        /* Side Menu */
        .side-menu-overlay {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.6);
            opacity: 0;
            visibility: hidden;
            transition: all 0.3s ease;
            z-index: 250;
        }

        .side-menu-overlay.show {
            opacity: 1;
            visibility: visible;
        }

        .side-menu {
            position: fixed;
            top: 0;
            left: 0;
            width: min(85%, 320px);
            height: 100%;
            max-height: 100vh;
            background: var(--bg-card);
            border-right: 1px solid var(--border);
            transform: translateX(-100%);
            transition: transform 0.35s cubic-bezier(0.16, 1, 0.3, 1);
            z-index: 251;
            display: flex;
            flex-direction: column;
            box-shadow: 8px 0 30px rgba(0, 0, 0, 0.4);
        }

        [data-theme="light"] .side-menu {
            box-shadow: 8px 0 30px rgba(0, 0, 0, 0.12);
        }

        .side-menu.show {
            transform: translateX(0);
        }

        .side-menu-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 16px;
            padding-top: calc(16px + env(safe-area-inset-top, 0px));
            border-bottom: 1px solid var(--border);
            flex-shrink: 0;
        }

        .side-menu-brand {
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .side-menu-brand h2 {
            font-size: 1rem;
            font-weight: 800;
            background: var(--gradient-1);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            line-height: 1.2;
        }

        .side-menu-brand span {
            font-size: 0.7rem;
            color: var(--text-muted);
            display: block;
        }

        .side-menu-close {
            width: 36px;
            height: 36px;
            border-radius: 12px;
            border: none;
            background: var(--bg-input);
            color: var(--text);
            font-size: 1rem;
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: center;
            transition: all 0.2s ease;
        }

        .side-menu-close:active {
            background: var(--danger);
            color: #fff;
            transform: scale(0.92);
        }

        .side-menu-body {
            flex: 1;
            overflow-y: auto;
            padding: 20px 16px;
        }

        .guide-section h3 {
            font-size: 0.95rem;
            font-weight: 700;
            color: var(--text);
            margin-bottom: 16px;
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .guide-section h3 i {
            color: var(--accent);
        }

        .guide-list {
            list-style: none;
            counter-reset: guide-step;
            display: flex;
            flex-direction: column;
            gap: 16px;
        }

        .guide-list li {
            position: relative;
            padding-left: 44px;
        }

        .guide-list li::before {
            counter-increment: guide-step;
            content: counter(guide-step);
            position: absolute;
            left: 0;
            top: 0;
            width: 28px;
            height: 28px;
            background: #64748B;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 0.75rem;
            font-weight: 800;
            color: #fff;
            box-shadow: 0 2px 6px rgba(0, 0, 0, 0.25);
        }

        [data-theme="light"] .guide-list li::before {
            background: #475569;
        }

        .guide-list li strong {
            display: block;
            font-size: 0.85rem;
            font-weight: 700;
            color: var(--text);
            margin-bottom: 4px;
        }

        .guide-list li p {
            font-size: 0.8rem;
            color: var(--text-muted);
            line-height: 1.5;
        }

        .guide-tip {
            margin-top: 24px;
            padding: 14px;
            background: rgba(251, 191, 36, 0.12);
            border: 1px solid rgba(251, 191, 36, 0.35);
            border-radius: 14px;
            display: flex;
            align-items: flex-start;
            gap: 12px;
        }

        [data-theme="light"] .guide-tip {
            background: rgba(245, 158, 11, 0.08);
        }

        .guide-tip i {
            color: var(--accent);
            font-size: 1.1rem;
            margin-top: 2px;
            flex-shrink: 0;
        }

        .guide-tip p {
            font-size: 0.8rem;
            color: var(--text);
            line-height: 1.5;
            font-weight: 500;
        }

        .side-menu-footer {
            padding: 16px;
            border-top: 1px solid var(--border);
            text-align: center;
            font-size: 0.75rem;
            color: var(--text-muted);
            flex-shrink: 0;
        }

        /* Toast */
        .toast {
            position: fixed;
            bottom: calc(90px + var(--safe-bottom));
            left: 50%;
            transform: translateX(-50%) translateY(100px);
            background: var(--bg-card);
            border: 1px solid var(--accent);
            border-radius: 14px;
            padding: 12px 22px;
            color: var(--text);
            font-size: 0.85rem;
            font-weight: 600;
            display: flex;
            align-items: center;
            gap: 10px;
            z-index: 300;
            opacity: 0;
            transition: all 0.4s ease;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
            max-width: 90%;
        }

        [data-theme="light"] .toast {
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
        }

        .toast.show {
            transform: translateX(-50%) translateY(0);
            opacity: 1;
        }

        /* Skeleton Loading Bar - Purple-blue / Cyan / Transparent */
        .skeleton {
            background: linear-gradient(
                90deg,
                #667eea 0%,
                #764ba2 30%,
                #00d4ff 60%,
                transparent 100%
            );
            background-size: 200% 100%;
            animation: shimmer 1.5s infinite;
            border-radius: 4px;
        }

        @keyframes shimmer {
            0% { background-position: 200% 0; }
            100% { background-position: -200% 0; }
        }

        /* Typing Indicator */
        .typing-indicator {
            display: none;
            padding: 20px;
            flex-direction: column;
            gap: 10px;
        }

        .typing-indicator.visible {
            display: flex;
        }

        .typing-indicator .skeleton {
            width: 100%;
            height: 12px;
        }

        .typing-indicator .skeleton-title {
            width: 60%;
            height: 16px;
            margin-bottom: 6px;
        }

        .typing-indicator .skeleton.short {
            width: 40%;
        }

        .char-count {
            font-size: 0.7rem;
            color: var(--text-muted);
            text-align: right;
            margin-top: 4px;
        }

        /* Footer */
        footer {
            text-align: center;
            padding: 20px 0 10px;
            color: var(--text-muted);
            font-size: 0.75rem;
        }
 
        /* Scroll Arrows */
        .scroll-arrow {
            position: absolute;
            right: 12px;
            width: 30px;
            height: 30px;
            border-radius: 50%;
            border: 1px solid var(--border);
            background: rgba(30, 41, 59, 0.85);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            color: var(--text);
            font-size: 0.7rem;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            box-shadow: 0 3px 10px rgba(0, 0, 0, 0.35);
            transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
            z-index: 90;
            opacity: 0;
            visibility: hidden;
            pointer-events: none;
        }

        [data-theme="light"] .scroll-arrow {
            background: rgba(255, 255, 255, 0.9);
            box-shadow: 0 4px 14px rgba(0, 0, 0, 0.12);
        }

        .scroll-arrow.show {
            opacity: 1;
            visibility: visible;
            transform: scale(1);
            pointer-events: auto;
        }

        .scroll-arrow:active {
            background: var(--primary);
            border-color: var(--primary);
            color: #fff;
            transform: scale(0.9);
        }

        .scroll-arrow-up {
            top: calc(var(--header-height, 62px) + 8px);
        }

        .scroll-arrow-down {
            bottom: calc(var(--bottom-nav-height, 62px) + 8px);
        }

        /* Hide legacy elements */
        .lang-toggle,
        .templates-section,
        .history-section,
        .tone-chips,
        .action-buttons {
            display: none !important;
        }

        /* Responsive desktop tweaks */
        @media (min-width: 520px) {
            .app-header {
                border-radius: 24px 24px 0 0;
            }
        }