/* ===================================================
   FollowScope — Refined Mobile-Optimized Theme
   =================================================== */

:root {
    /* DEFAULT: Light Mode Variables */
    --bg-main: #f8fafc;
    --bg-card: #ffffff;
    --bg-hover: #f1f5f9;
    --border-color: #e2e8f0;
    --border-focus: #94a3b8;
    --text-main: #0f172a;
    --text-muted: #64748b;
    --text-dim: #94a3b8;
    --accent: #0f172a;
    --accent-bg: #f1f5f9;
    
    /* Highlight Orange Colors */
    --highlight-bg: #fff8f0;
    --highlight-border: #fed7aa;
    --highlight-text: #c2410c;

    /* Green File Success Theme */
    --success-text: #059669;
    --success-bg: #f0fdf4;
    --success-border: #bbf7d0;

    /* Shadow & Border Radius Variables */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-full: 9999px;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 12px -2px rgba(0, 0, 0, 0.05);
}

/* Dark Mode Theme Switcher */
body.dark-theme {
    --bg-main: #0a0a0a;
    --bg-card: #141414;
    --bg-hover: #1f1f1f;
    --border-color: #262626;
    --border-focus: #525252;
    --text-main: #f5f5f5;
    --text-muted: #a3a3a3;
    --text-dim: #525252;
    --accent: #ffffff;
    --accent-bg: #1f1f1f;

    /* Dark Mode Highlight Orange Colors */
    --highlight-bg: #21150c;
    --highlight-border: #633311;
    --highlight-text: #fb923c;

    /* Dark Mode Green Success Theme */
    --success-text: #34d399;
    --success-bg: #062c1b;
    --success-border: #065f46;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.4);
    --shadow-md: 0 4px 12px -2px rgba(0, 0, 0, 0.5);
}

/* Base Resets & Layout Centering */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    background-color: var(--bg-main);
    color: var(--text-main);
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    padding: 2.5rem 1.25rem;
    min-height: 100vh;
    width: 100%;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
    overflow-x: hidden;
}

/* Container Centering & Dynamic Width */
.app-container {
    width: 100%;
    max-width: 780px;
    margin: 0 auto;
}

/* Navbar Navigation */
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2.25rem;
    gap: 0.5rem;
}

.brand {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-main);
    cursor: pointer;
    user-select: none;
    transition: opacity 0.2s ease;
}

.brand:hover {
    opacity: 0.75;
}

.brand-title {
    font-weight: 700;
    font-size: 1.2rem;
    letter-spacing: -0.03em;
}

.nav-controls {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.lang-select,
.theme-btn {
    background-color: var(--bg-card);
    color: var(--text-main);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 0.5rem 0.75rem;
    font-size: 0.825rem;
    font-family: inherit;
    font-weight: 500;
    cursor: pointer;
    outline: none;
    box-shadow: var(--shadow-sm);
    min-height: 40px;
    transition: border-color 0.2s ease, background-color 0.2s ease, transform 0.15s ease;
}

.lang-select:hover, .theme-btn:hover {
    border-color: var(--border-focus);
    background-color: var(--bg-hover);
}

.theme-btn {
    display: flex;
    align-items: center;
    gap: 0.45rem;
}

/* Header Section (Centered) */
.header {
    margin-bottom: 2rem;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.security-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-muted);
    border: 1px solid var(--border-color);
    background-color: var(--bg-card);
    padding: 0.4rem 0.85rem;
    border-radius: var(--radius-full);
    margin-bottom: 0.85rem;
    box-shadow: var(--shadow-sm);
}

.header h1 {
    font-size: 2rem;
    font-weight: 700;
    letter-spacing: -0.035em;
    margin-bottom: 0.5rem;
    color: var(--text-main);
}

.subtitle {
    color: var(--text-muted);
    font-size: 0.925rem;
    line-height: 1.6;
    max-width: 620px;
}

/* Multi-Step Wizard Progress Bar */
.wizard-progress {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 2rem;
    border: 1px solid var(--border-color);
    background-color: var(--bg-card);
    padding: 0.95rem 1.25rem;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
}

.progress-step {
    display: flex;
    align-items: center;
    gap: 0.55rem;
    opacity: 0.35;
    transition: opacity 0.2s ease;
}

.progress-step.active {
    opacity: 1;
}

.step-num {
    font-size: 0.75rem;
    font-weight: 700;
    border: 1px solid currentColor;
    width: 24px;
    height: 24px;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.step-text {
    font-size: 0.825rem;
    font-weight: 600;
}

.progress-line {
    flex: 1;
    height: 1px;
    background-color: var(--border-color);
    margin: 0 0.75rem;
    transition: background-color 0.2s ease;
}

.progress-line.active {
    background-color: var(--text-main);
}

/* Wizard Screens */
.wizard-screen {
    display: none;
}

.wizard-screen.active {
    display: block;
}

.screen-title {
    margin-bottom: 1.5rem;
    text-align: center;
}

.screen-title h2 {
    font-size: 1.35rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.screen-title p {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-top: 0.3rem;
}

/* Step 1: Platform Cards */
.platform-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    margin-bottom: 1.75rem;
}

.platform-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 1.25rem 1rem;
    text-align: left;
    cursor: pointer;
    color: var(--text-main);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    min-height: 110px;
    box-shadow: var(--shadow-sm);
    transition: border-color 0.2s ease, background-color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
}

.platform-card:hover:not(.disabled) {
    border-color: var(--border-focus);
    background-color: var(--bg-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.platform-card.active {
    border-color: var(--text-main);
    background-color: var(--accent-bg);
}

.platform-card.disabled {
    opacity: 0.35;
    cursor: not-allowed;
}

.platform-icon {
    width: 24px;
    height: 24px;
    color: var(--text-main);
}

.platform-tag {
    font-size: 0.725rem;
    color: var(--text-muted);
    font-weight: 500;
}

/* Step 2: Choice Cards */
.choice-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-bottom: 1.75rem;
}

.choice-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 1.35rem 1.15rem;
    text-align: left;
    cursor: pointer;
    color: var(--text-main);
    display: flex;
    flex-direction: column;
    gap: 0.65rem;
    box-shadow: var(--shadow-sm);
    transition: border-color 0.2s ease, background-color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
}

.choice-card:hover {
    border-color: var(--border-focus);
    background-color: var(--bg-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.choice-icon-wrap {
    width: 36px;
    height: 36px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--bg-main);
}

.choice-card h3 {
    font-size: 1rem;
    font-weight: 600;
}

.choice-card p {
    font-size: 0.825rem;
    color: var(--text-muted);
    line-height: 1.5;
    flex: 1;
}

.choice-action {
    font-size: 0.825rem;
    font-weight: 600;
    color: var(--text-main);
    margin-top: 0.5rem;
}

/* 3-Way Device Switcher Bar for Tutorials */
.device-toggle-wrap {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.4rem;
    margin-bottom: 1.25rem;
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    padding: 0.35rem;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
}

.device-toggle-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
    padding: 0.55rem 0.5rem;
    font-size: 0.825rem;
    font-weight: 600;
    font-family: inherit;
    background-color: transparent;
    color: var(--text-muted);
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    min-height: 40px;
    transition: all 0.2s ease;
}

.device-toggle-btn.active {
    background-color: var(--text-main);
    color: var(--bg-main);
    box-shadow: var(--shadow-sm);
}

/* Device Tutorial Steps Container */
.tutorial-steps {
    display: none;
    flex-direction: column;
    gap: 0.85rem;
    margin-bottom: 1.75rem;
}

.tutorial-steps.active {
    display: flex;
}

.step-card {
    display: flex;
    gap: 1.15rem;
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 1rem 1.25rem;
    align-items: flex-start;
    box-shadow: var(--shadow-sm);
}

.step-number {
    font-weight: 700;
    color: var(--text-muted);
    font-size: 0.875rem;
    padding-top: 0.1rem;
    flex-shrink: 0;
}

.step-content strong {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-main);
}

.step-content p {
    font-size: 0.825rem;
    color: var(--text-muted);
    margin-top: 0.25rem;
    line-height: 1.5;
}

.inline-link {
    color: var(--text-main);
    text-decoration: underline;
    text-underline-offset: 2px;
}

/* Step 3: Upload Dropzones */
.dropzone-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-bottom: 1.75rem;
}

.dropzone {
    border: 1px dashed var(--border-color);
    background-color: var(--bg-card);
    border-radius: var(--radius-md);
    padding: 2rem 1.25rem;
    text-align: center;
    cursor: pointer;
    box-shadow: var(--shadow-sm);
    transition: border-color 0.2s ease, background-color 0.2s ease, box-shadow 0.2s ease;
}

.dropzone:hover, .dropzone.dragover {
    border-color: var(--text-main);
    background-color: var(--bg-hover);
    box-shadow: var(--shadow-md);
}

.dropzone input[type="file"] {
    display: none;
}

.icon-wrapper {
    width: 42px;
    height: 42px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 0.9rem auto;
    background-color: var(--bg-main);
}

.dropzone h3 {
    font-size: 0.925rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.file-hint {
    font-size: 0.775rem;
    color: var(--text-muted);
}

/* Dropzone Success State & Remove Button */
.dropzone.has-file {
    border-color: var(--success-border);
    background-color: var(--success-bg);
}

.file-status-wrap {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    margin-top: 0.85rem;
    padding: 0.35rem 0.75rem;
    background-color: var(--bg-card);
    border: 1px solid var(--success-border);
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-sm);
    max-width: 100%;
}

.file-name.success-text {
    color: var(--success-text);
    font-size: 0.825rem;
    font-weight: 600;
    word-break: break-all;
}

.remove-file-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 1.2rem;
    line-height: 1;
    cursor: pointer;
    padding: 0.1rem 0.3rem;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: color 0.15s ease, background-color 0.15s ease;
}

.remove-file-btn:hover {
    color: var(--highlight-text);
    background-color: var(--bg-hover);
}

/* Buttons */
.primary-btn, .secondary-btn {
    padding: 0.7rem 1.35rem;
    font-size: 0.875rem;
    font-weight: 600;
    font-family: inherit;
    border: 1px solid var(--text-main);
    background-color: var(--text-main);
    color: var(--bg-main);
    cursor: pointer;
    border-radius: var(--radius-sm);
    min-height: 44px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: opacity 0.2s ease, background-color 0.2s ease, transform 0.15s ease;
}

.primary-btn:hover:not(:disabled) {
    opacity: 0.9;
}

.primary-btn:disabled {
    opacity: 0.35;
    cursor: not-allowed;
}

.secondary-btn {
    background-color: transparent;
    color: var(--text-main);
    border-color: var(--border-color);
}

.secondary-btn:hover {
    border-color: var(--border-focus);
    background-color: var(--bg-hover);
}

.screen-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 0.75rem;
}

/* Step 4: Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0.75rem;
    margin-bottom: 1.25rem;
}

.stat-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 0.9rem 0.75rem;
    display: flex;
    flex-direction: column;
    gap: 0.3rem;
    box-shadow: var(--shadow-sm);
}

.stat-card.highlight {
    background-color: var(--highlight-bg);
    border-color: var(--highlight-border);
}

.stat-title {
    font-size: 0.7rem;
    color: var(--text-muted);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.025em;
}

.stat-card.highlight .stat-title {
    color: var(--highlight-text);
}

.stat-value {
    font-size: 1.4rem;
    font-weight: 700;
    letter-spacing: -0.025em;
}

/* Highlighted Orange Disclaimer Banner */
.disclaimer-banner {
    display: flex;
    align-items: flex-start;
    gap: 0.65rem;
    font-size: 0.8rem;
    color: var(--highlight-text);
    background-color: var(--highlight-bg);
    border: 1px solid var(--highlight-border);
    border-radius: var(--radius-md);
    padding: 0.85rem 1rem;
    margin-bottom: 1.5rem;
    line-height: 1.55;
    box-shadow: var(--shadow-sm);
}

.disclaimer-banner svg {
    flex-shrink: 0;
    color: var(--highlight-text);
    margin-top: 0.15rem;
}

/* Tabs & Account Controls */
.tabs-container {
    margin-bottom: 1rem;
}

.tabs {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 0.85rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.5rem;
    overflow-x: auto;
}

.tab-btn {
    background-color: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 0.85rem;
    font-weight: 600;
    padding: 0.45rem 0.65rem;
    cursor: pointer;
    font-family: inherit;
    display: flex;
    align-items: center;
    gap: 0.45rem;
    white-space: nowrap;
    transition: color 0.2s ease;
}

.tab-btn:hover {
    color: var(--text-main);
}

.tab-btn.active {
    color: var(--text-main);
    border-bottom: 2px solid var(--text-main);
    margin-bottom: -0.55rem;
}

.badge {
    background-color: var(--border-color);
    color: var(--text-main);
    padding: 0.15rem 0.5rem;
    font-size: 0.725rem;
    font-weight: 700;
    border-radius: var(--radius-full);
}

.list-controls {
    display: flex;
    gap: 0.6rem;
    align-items: center;
}

#search-input {
    flex: 1;
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-main);
    padding: 0.6rem 0.85rem;
    font-size: 0.875rem;
    font-family: inherit;
    outline: none;
    box-shadow: var(--shadow-sm);
    min-height: 40px;
    transition: border-color 0.2s ease;
}

#search-input:focus {
    border-color: var(--border-focus);
}

.action-btn-group {
    display: flex;
    gap: 0.4rem;
}

/* User Account List */
.list-wrapper {
    border: 1px solid var(--border-color);
    background-color: var(--bg-card);
    border-radius: var(--radius-md);
    max-height: 420px;
    overflow-y: auto;
    box-shadow: var(--shadow-sm);
}

.list-wrapper::-webkit-scrollbar {
    width: 6px;
}
.list-wrapper::-webkit-scrollbar-track {
    background: transparent;
}
.list-wrapper::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: var(--radius-full);
}

.user-list {
    list-style: none;
}

.user-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--border-color);
    font-size: 0.875rem;
    gap: 0.5rem;
    transition: background-color 0.15s ease, opacity 0.15s ease;
}

.user-item:last-child {
    border-bottom: none;
}

.user-item:hover {
    background-color: var(--bg-hover);
}

.user-item.visited {
    opacity: 0.45;
}

.user-item.visited .username-link {
    text-decoration: line-through;
}

.username-link {
    color: var(--text-main);
    text-decoration: none;
    font-weight: 500;
    word-break: break-all;
}

.username-link:hover {
    text-decoration: underline;
}

.visit-checkbox {
    cursor: pointer;
    width: 18px;
    height: 18px;
    accent-color: var(--text-main);
    border-radius: 4px;
    flex-shrink: 0;
}

/* FAQ Section */
.faq-section {
    margin-top: 3.25rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
    text-align: left;
}

.faq-section h2 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 1.25rem;
    text-align: center;
}

.faq-item {
    margin-bottom: 1.25rem;
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 1.1rem 1.2rem;
    box-shadow: var(--shadow-sm);
}

.faq-item h3 {
    font-size: 0.925rem;
    font-weight: 600;
    margin-bottom: 0.35rem;
}

.faq-item p {
    font-size: 0.85rem;
    color: var(--text-muted);
    line-height: 1.55;
}

/* Footer */
footer {
    margin-top: 2.5rem;
    text-align: center;
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* Responsive Rules for Small Screens & Mobile Phones */
@media (max-width: 640px) {
    body {
        padding: 1.5rem 0.85rem;
    }

    .header h1 {
        font-size: 1.6rem;
    }

    .subtitle {
        font-size: 0.85rem;
    }

    .platform-grid {
        grid-template-columns: 1fr;
        gap: 0.75rem;
    }

    .choice-grid,
    .dropzone-grid {
        grid-template-columns: 1fr;
        gap: 0.85rem;
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 0.6rem;
    }

    .stat-value {
        font-size: 1.25rem;
    }

    .step-text {
        display: none;
    }

    .wizard-progress {
        padding: 0.75rem 0.85rem;
    }

    .progress-line {
        margin: 0 0.4rem;
    }

    .list-controls {
        flex-direction: column;
        align-items: stretch;
    }

    .action-btn-group {
        display: grid;
        grid-template-columns: 1fr 1fr;
    }

    .user-item {
        padding: 0.65rem 0.75rem;
    }

    .device-toggle-btn {
        font-size: 0.75rem;
        padding: 0.45rem 0.25rem;
    }
}