/* ============================================
   HiDef - Modern Mobile-First App UI
   Inspired by Snapchat, TikTok, Instagram
   ============================================ */

:root {
    --primary: #0d6efd;
    --primary-dark: #0a58ca;
    --secondary: #6c757d;
    --success: #198754;
    --danger: #dc3545;
    --warning: #ffc107;
    --info: #0dcaf0;
    --light: #f8f9fa;
    --dark: #212529;
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #0d6efd 0%, #0dcaf0 100%);
    --gradient-bg: linear-gradient(180deg, #0f1724 0%, #0b1220 100%);
    
    /* Colors */
    --bg-primary: #0f1724;
    --bg-secondary: #1a2234;
    --bg-tertiary: rgba(255, 255, 255, 0.03);
    --text-primary: #e9eef8;
    --text-secondary: #a8b2cc;
    --border-color: rgba(255, 255, 255, 0.08);
    
    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    
    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 400ms ease;
}

/* ============================================
   Base Styles
   ============================================ */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    background: var(--gradient-bg);
    color: var(--text-primary);
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    line-height: 1.5;
}

.hidef-app {
    display: flex;
    flex-direction: column;
    height: 100vh;
    background: var(--gradient-bg);
}

/* ============================================
   App Layout
   ============================================ */

.app-layout {
    display: flex;
    flex-direction: column;
    height: 100vh;
    position: relative;
}

.app-header {
    background: rgba(15, 23, 36, 0.8);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    padding: var(--spacing-md);
    position: sticky;
    top: 0;
    z-index: 100;
    min-height: 56px;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 600px;
    margin: 0 auto;
    width: 100%;
}

.app-title {
    font-size: 24px;
    font-weight: 700;
    letter-spacing: -0.5px;
    margin: 0;
}

.header-btn {
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: 20px;
    cursor: pointer;
    padding: var(--spacing-sm);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

.header-btn:hover {
    background: rgba(255, 255, 255, 0.08);
    color: var(--primary);
}

/* ============================================
   Main Content Area
   ============================================ */

.app-main {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    padding-bottom: 70px;
    scroll-behavior: smooth;
}

.content-wrapper {
    max-width: 600px;
    margin: 0 auto;
    width: 100%;
    padding: var(--spacing-md);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

/* ============================================
   Upload Section
   ============================================ */

.upload-section {
    scroll-margin-top: 60px;
}

.upload-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.upload-card {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    text-align: center;
}

.upload-input-wrapper {
    position: relative;
    cursor: pointer;
    margin-bottom: var(--spacing-md);
}

.file-input {
    display: none;
}

.file-input.hidden {
    display: none;
}

.upload-btn-large {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    padding: var(--spacing-xl) var(--spacing-lg);
    background: var(--gradient-primary);
    color: white;
    border: none;
    border-radius: var(--radius-lg);
    font-size: 18px;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-base);
    width: 100%;
    min-height: 120px;
}

.upload-btn-large:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 24px rgba(13, 110, 253, 0.3);
}

.upload-btn-large i {
    font-size: 32px;
}

.help-text {
    font-size: 12px;
    color: var(--text-secondary);
    margin: 0;
    margin-top: var(--spacing-sm);
}

/* ============================================
   Preview Container
   ============================================ */

.preview-container {
    display: none;
    border-radius: var(--radius-lg);
    overflow: hidden;
    animation: slideUp var(--transition-slow);
}

.preview-container.active {
    display: block;
}

.img-preview {
    width: 100%;
    height: auto;
    display: block;
    border-radius: var(--radius-lg);
    animation: fadeIn var(--transition-base);
    opacity: 0;
    transform: translateY(6px);
    transition: opacity var(--transition-base), transform var(--transition-base);
}

.img-preview.loaded {
    opacity: 1;
    transform: translateY(0);
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(16px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

/* ============================================
   Form Sections
   ============================================ */

.comment-section,
.voice-section,
.ranking-section {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.section-label {
    font-weight: 600;
    font-size: 14px;
    color: var(--text-primary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.comment-input {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    font-family: inherit;
    font-size: 14px;
    resize: vertical;
    transition: all var(--transition-fast);
    min-height: 80px;
}

.comment-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 2px rgba(13, 110, 253, 0.1);
    background: rgba(13, 110, 253, 0.03);
}

/* ============================================
   Voice Section
   ============================================ */

.voice-controls {
    display: flex;
    gap: var(--spacing-md);
    align-items: center;
}

.btn-voice {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    border-radius: var(--radius-md);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.btn-voice:hover {
    background: rgba(13, 110, 253, 0.15);
    border-color: var(--primary);
    color: var(--primary);
}

/* ============================================
   Progress Bar
   ============================================ */

.progress-container {
    width: 100%;
}

.progress {
    width: 100%;
    height: 6px;
    background: var(--bg-tertiary);
    border-radius: 3px;
    overflow: hidden;
}

.progress-bar {
    height: 100%;
    background: var(--gradient-primary);
    width: 0%;
    transition: width var(--transition-base);
    border-radius: 3px;
}

/* ============================================
   Action Buttons
   ============================================ */

.action-buttons {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.btn-primary-large {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--gradient-primary);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-base);
    min-height: 48px;
    width: 100%;
}

.btn-primary-large:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 8px 16px rgba(13, 110, 253, 0.3);
}

.btn-primary-large:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-secondary-small {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    min-height: 44px;
}

.btn-secondary-small:hover {
    background: rgba(255, 255, 255, 0.06);
    border-color: var(--text-primary);
}

/* ============================================
   Response Section
   ============================================ */

.response-section {
    scroll-margin-top: 60px;
}

.response-card {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.response-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
}

.response-title {
    font-size: 18px;
    font-weight: 600;
    margin: 0;
}

.btn-view-all {
    background: transparent;
    border: none;
    color: var(--primary);
    font-size: 18px;
    cursor: pointer;
    padding: var(--spacing-sm);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-view-all:hover {
    background: rgba(13, 110, 253, 0.15);
}

.response-content {
    max-height: 200px;
    overflow-y: auto;
}

.response-text {
    width: 100%;
    background: rgba(255, 255, 255, 0.02);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    font-family: inherit;
    font-size: 14px;
    resize: vertical;
    min-height: 100px;
}

.response-text:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 2px rgba(13, 110, 253, 0.1);
}

/* ============================================
   AI Image & Audio
   ============================================ */

.ai-image-container {
    position: relative;
    width: 100%;
    border-radius: var(--radius-lg);
    overflow: hidden;
    min-height: 200px;
    background: rgba(255, 255, 255, 0.02);
    display: flex;
    align-items: center;
    justify-content: center;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border-color);
    border-top: 3px solid var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.ai-image {
    width: 100%;
    height: auto;
    display: block;
    border-radius: var(--radius-lg);
    animation: fadeIn var(--transition-base);
}

.ai-audio-container {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.audio-player {
    width: 100%;
    height: 40px;
    border-radius: var(--radius-md);
    background: rgba(255, 255, 255, 0.03);
}

/* ============================================
   Bottom Navigation
   ============================================ */

.app-footer {
    display: flex;
    justify-content: space-around;
    align-items: center;
    gap: var(--spacing-md);
    background: rgba(15, 23, 36, 0.8);
    backdrop-filter: blur(10px);
    border-top: 1px solid var(--border-color);
    padding: var(--spacing-sm) 0;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: 70px;
    z-index: 200;
}

.footer-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    font-size: 12px;
    font-weight: 600;
    transition: all var(--transition-fast);
    flex: 1;
    min-height: 70px;
}

.footer-btn i {
    font-size: 24px;
}

.footer-btn:hover,
.footer-btn.active {
    color: var(--primary);
    background: rgba(13, 110, 253, 0.1);
}

.footer-btn.active {
    background: rgba(13, 110, 253, 0.15);
}

/* ============================================
   Toast Notifications
   ============================================ */

.toast-container {
    position: fixed;
    top: 70px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 1000;
    max-width: 500px;
    width: calc(100% - var(--spacing-md) * 2);
    pointer-events: none;
}

.toast {
    background: rgba(13, 110, 253, 0.95);
    backdrop-filter: blur(10px);
    color: white;
    border-radius: var(--radius-md);
    padding: var(--spacing-md) var(--spacing-lg);
    margin-bottom: var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-md);
    box-shadow: 0 8px 24px rgba(13, 110, 253, 0.3);
    animation: slideDown var(--transition-base);
    pointer-events: all;
}

.toast.toast-loading {
    background: rgba(13, 110, 253, 0.95);
}

.toast.toast-success {
    background: rgba(25, 135, 84, 0.95);
}

.toast.toast-error {
    background: rgba(220, 53, 69, 0.95);
}

.toast.toast-warning {
    background: rgba(255, 193, 7, 0.95);
    color: #212529;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.toast-content {
    flex: 1;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.toast-close {
    background: transparent;
    border: none;
    color: white;
    cursor: pointer;
    padding: var(--spacing-xs);
    font-size: 16px;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

.toast-close:hover {
    transform: scale(1.2);
}

/* ============================================
   Modal Styles
   ============================================ */

.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    display: none;
    align-items: flex-end;
    z-index: 999;
    animation: fadeIn var(--transition-fast);
}

.modal-overlay.active {
    display: flex;
}

.modal-content {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
    max-height: 90vh;
    overflow-y: auto;
    width: 100%;
    max-width: 600px;
    margin: 0 auto;
    animation: slideUp var(--transition-base);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    background: var(--bg-secondary);
    z-index: 10;
}

.modal-header h2 {
    font-size: 18px;
    font-weight: 600;
    margin: 0;
}

.modal-close {
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: 20px;
    cursor: pointer;
    padding: var(--spacing-sm);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-close:hover {
    background: var(--bg-tertiary);
    color: var(--primary);
}

.modal-body {
    padding: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.requirement-item {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
}

.requirement-item h3 {
    font-size: 16px;
    font-weight: 600;
    margin: 0;
    color: var(--primary);
}

.requirement-item p,
.requirement-item ul {
    margin: 0;
    font-size: 14px;
    color: var(--text-secondary);
}

.requirement-item ul {
    padding-left: var(--spacing-lg);
}

.stat-display {
    position: relative;
    width: 100%;
    border-radius: var(--radius-lg);
    overflow: hidden;
    min-height: 300px;
    background: var(--bg-tertiary);
    display: flex;
    align-items: center;
    justify-content: center;
}

.stat-info {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.stat-info p {
    font-size: 16px;
    margin: 0;
    color: var(--text-primary);
}

.stat-info strong {
    color: var(--primary);
}

/* ============================================
   Pop Animation (for AI generated images)
   ============================================ */

@keyframes popIn {
    0% {
        transform: scale(0.96);
        opacity: 0;
    }
    60% {
        transform: scale(1.02);
        opacity: 1;
    }
    100% {
        transform: scale(1);
        opacity: 1;
    }
}

.pop {
    animation: popIn 0.24s cubic-bezier(0.2, 0.9, 0.3, 1) both;
}

/* ============================================
   Responsive Design
   ============================================ */

@media (max-width: 480px) {
    .app-header {
        padding: var(--spacing-sm);
    }

    .app-title {
        font-size: 20px;
    }

    .content-wrapper {
        padding: var(--spacing-sm);
        gap: var(--spacing-md);
    }

    .upload-btn-large {
        min-height: 100px;
        font-size: 16px;
    }

    .upload-btn-large i {
        font-size: 28px;
    }

    .modal-content {
        border-radius: var(--radius-lg) var(--radius-lg) 0 0;
        max-height: 85vh;
    }

    .footer-btn span {
        font-size: 10px;
    }
}

/* ============================================
   Utility Classes
   ============================================ */

.hidden {
    display: none !important;
}

.text-center {
    text-align: center;
}

.text-muted {
    color: var(--text-secondary);
}

.mt-1 { margin-top: var(--spacing-sm); }
.mt-2 { margin-top: var(--spacing-md); }
.mb-1 { margin-bottom: var(--spacing-sm); }
.mb-2 { margin-bottom: var(--spacing-md); }

/* ============================================
   Scrollbar Styling
   ============================================ */

::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.2);
}

/* ============================================
   Print Styles
   ============================================ */

@media print {
    .app-header,
    .app-footer,
    .toast-container {
        display: none;
    }
}