/* ========================================
   CSS Variables & Design System
======================================== */
:root {
    /* Colors */
    --color-bg: #0a0a0f;
    --color-bg-secondary: #12121a;
    --color-bg-tertiary: #1a1a24;
    --color-surface: rgba(255, 255, 255, 0.03);
    --color-surface-hover: rgba(255, 255, 255, 0.06);
    --color-border: rgba(255, 255, 255, 0.08);
    --color-border-hover: rgba(255, 255, 255, 0.15);

    --color-text: #ffffff;
    --color-text-secondary: rgba(255, 255, 255, 0.6);
    --color-text-muted: rgba(255, 255, 255, 0.4);

    --color-primary: #76b900;
    --color-primary-light: #8ed100;
    --color-primary-dark: #5a8f00;
    --color-primary-glow: rgba(118, 185, 0, 0.3);

    --color-accent: #00d4aa;
    --color-accent-glow: rgba(0, 212, 170, 0.3);

    --color-error: #ff4757;
    --color-success: #2ed573;
    --color-warning: #ffa502;

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #76b900 0%, #00d4aa 100%);
    --gradient-dark: linear-gradient(180deg, #12121a 0%, #0a0a0f 100%);
    --gradient-glass: linear-gradient(135deg, rgba(255, 255, 255, 0.1) 0%, rgba(255, 255, 255, 0.02) 100%);

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;
    --font-size-4xl: 2.5rem;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;

    /* Border Radius */
    --radius-sm: 0.5rem;
    --radius-md: 0.75rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 40px var(--color-primary-glow);

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-base: 0.25s ease;
    --transition-slow: 0.4s ease;
}

/* ========================================
   Reset & Base Styles
======================================== */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

.gradient-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.4;
    animation: float 20s infinite ease-in-out;
}

.orb-1 {
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, var(--color-primary) 0%, transparent 70%);
    top: -200px;
    right: -100px;
    animation-delay: 0s;
}

.orb-2 {
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, var(--color-accent) 0%, transparent 70%);
    bottom: -150px;
    left: -100px;
    animation-delay: -7s;
}

.orb-3 {
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, #6366f1 0%, transparent 70%);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation-delay: -14s;
}

@keyframes float {

    0%,
    100% {
        transform: translate(0, 0) scale(1);
    }

    25% {
        transform: translate(30px, -30px) scale(1.05);
    }

    50% {
        transform: translate(-20px, 20px) scale(0.95);
    }

    75% {
        transform: translate(-30px, -20px) scale(1.02);
    }
}

/* ========================================
   Container & Layout
======================================== */
.container {
    position: relative;
    z-index: 1;
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-xl);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ========================================
   Header
======================================== */
.header {
    text-align: center;
    padding: var(--spacing-3xl) 0 var(--spacing-2xl);
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.logo-icon {
    width: 48px;
    height: 48px;
    background: var(--gradient-primary);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-glow);
    animation: pulse 3s infinite ease-in-out;
}

.logo-icon svg {
    width: 28px;
    height: 28px;
    color: white;
}

@keyframes pulse {

    0%,
    100% {
        box-shadow: 0 0 20px var(--color-primary-glow);
    }

    50% {
        box-shadow: 0 0 40px var(--color-primary-glow), 0 0 60px var(--color-primary-glow);
    }
}

.logo h1 {
    font-size: var(--font-size-3xl);
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.02em;
}

.tagline {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    font-weight: 400;
}

/* ========================================
   Main Content
======================================== */
.main-content {
    flex: 1;
}

/* ========================================
   Upload Section
======================================== */
.upload-section {
    margin-bottom: var(--spacing-3xl);
}

.upload-grid {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: var(--spacing-lg);
    align-items: center;
    margin-bottom: var(--spacing-2xl);
}

@media (max-width: 768px) {
    .upload-grid {
        grid-template-columns: 1fr;
    }
}

/* Upload Card */
.upload-card {
    background: var(--gradient-glass);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--spacing-lg);
    backdrop-filter: blur(20px);
    transition: all var(--transition-base);
}

.upload-card:hover {
    border-color: var(--color-border-hover);
    box-shadow: var(--shadow-md);
}

.upload-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.upload-badge {
    font-size: var(--font-size-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: var(--spacing-xs) var(--spacing-sm);
    background: var(--color-primary);
    color: white;
    border-radius: var(--radius-sm);
}

.upload-badge.test {
    background: var(--color-accent);
}

.upload-label {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

/* Drop Zone */
.drop-zone {
    position: relative;
    border: 2px dashed var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-2xl);
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-base);
    min-height: 250px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.drop-zone:hover,
.drop-zone.dragover {
    border-color: var(--color-primary);
    background: rgba(118, 185, 0, 0.05);
}

.drop-zone.has-file {
    border-style: solid;
    border-color: var(--color-primary);
    padding: 0;
}

.drop-zone-content {
    transition: opacity var(--transition-base);
}

.drop-zone.has-file .drop-zone-content {
    opacity: 0;
    pointer-events: none;
}

.upload-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto var(--spacing-md);
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-base);
}

.drop-zone:hover .upload-icon {
    background: rgba(118, 185, 0, 0.1);
    transform: translateY(-4px);
}

.upload-icon svg {
    width: 32px;
    height: 32px;
    color: var(--color-text-secondary);
    transition: color var(--transition-base);
}

.drop-zone:hover .upload-icon svg {
    color: var(--color-primary);
}

.drop-text {
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xs);
}

.drop-text span {
    color: var(--color-primary);
    font-weight: 500;
}

.drop-hint {
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
}

/* Preview Image */
.preview-image {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0;
    transition: opacity var(--transition-base);
    border-radius: calc(var(--radius-lg) - 2px);
}

.drop-zone.has-file .preview-image {
    opacity: 1;
}

/* Remove Button */
.remove-btn {
    position: absolute;
    top: var(--spacing-sm);
    right: var(--spacing-sm);
    width: 36px;
    height: 36px;
    background: rgba(0, 0, 0, 0.7);
    border: none;
    border-radius: var(--radius-full);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: all var(--transition-base);
    backdrop-filter: blur(10px);
}

.drop-zone.has-file:hover .remove-btn {
    opacity: 1;
}

.remove-btn:hover {
    background: var(--color-error);
    transform: scale(1.1);
}

.remove-btn svg {
    width: 18px;
    height: 18px;
    color: white;
}

/* Compare Divider */
.compare-divider {
    display: flex;
    align-items: center;
    justify-content: center;
}

.compare-icon {
    width: 56px;
    height: 56px;
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    animation: rotate 20s linear infinite;
}

.compare-icon svg {
    width: 24px;
    height: 24px;
    color: var(--color-primary);
}

@keyframes rotate {
    from {
        transform: rotate(0deg);
    }

    to {
        transform: rotate(360deg);
    }
}

@media (max-width: 768px) {
    .compare-divider {
        transform: rotate(90deg);
    }
}

/* ========================================
   Compare Button
======================================== */
.compare-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    max-width: 320px;
    margin: 0 auto;
    padding: var(--spacing-md) var(--spacing-xl);
    background: var(--gradient-primary);
    border: none;
    border-radius: var(--radius-lg);
    font-family: inherit;
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: white;
    cursor: pointer;
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.compare-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s ease;
}

.compare-btn:not(:disabled):hover::before {
    left: 100%;
}

.compare-btn:not(:disabled):hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

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

.compare-btn.loading {
    pointer-events: none;
}

.btn-content,
.btn-loading {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.btn-loading {
    display: none;
}

.compare-btn.loading .btn-content {
    display: none;
}

.compare-btn.loading .btn-loading {
    display: flex;
}

.btn-content svg {
    width: 22px;
    height: 22px;
}

/* Spinner */
.spinner {
    width: 22px;
    height: 22px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* ========================================
   Results Section
======================================== */
.results-section {
    display: none;
    animation: fadeInUp 0.5s ease;
}

.results-section.visible {
    display: block;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.results-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--color-border);
}

.results-header h2 {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.processing-time {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    background: var(--color-surface);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-full);
    border: 1px solid var(--color-border);
}

.results-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

/* Result Card */
.result-card {
    background: var(--gradient-glass);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    overflow: hidden;
    transition: all var(--transition-base);
    animation: fadeInUp 0.5s ease backwards;
}

.result-card:nth-child(1) {
    animation-delay: 0.1s;
}

.result-card:nth-child(2) {
    animation-delay: 0.2s;
}

.result-card:nth-child(3) {
    animation-delay: 0.3s;
}

.result-card:nth-child(4) {
    animation-delay: 0.4s;
}

.result-card:hover {
    transform: translateY(-4px);
    border-color: var(--color-primary);
    box-shadow: var(--shadow-glow);
}

.result-card img {
    width: 100%;
    height: 280px;
    object-fit: contain;
    background: var(--color-bg-secondary);
}

.result-card-info {
    padding: var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.result-card-name {
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-text);
}

.result-card-download {
    width: 36px;
    height: 36px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-base);
    text-decoration: none;
}

.result-card-download:hover {
    background: var(--color-primary);
    border-color: var(--color-primary);
}

.result-card-download svg {
    width: 18px;
    height: 18px;
    color: var(--color-text-secondary);
    transition: color var(--transition-base);
}

.result-card-download:hover svg {
    color: white;
}

/* ========================================
   Footer
======================================== */
.footer {
    text-align: center;
    padding: var(--spacing-2xl) 0 var(--spacing-xl);
    margin-top: auto;
}

.footer p {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
}

.footer strong {
    color: var(--color-primary);
    font-weight: 600;
}

.footer-links {
    margin-top: var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
}

.footer-links a {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.footer-links a:hover {
    color: var(--color-primary);
}

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

/* ========================================
   Toast Notification
======================================== */
.toast {
    position: fixed;
    bottom: var(--spacing-xl);
    right: var(--spacing-xl);
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md) var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    box-shadow: var(--shadow-lg);
    backdrop-filter: blur(20px);
    transform: translateY(150%);
    opacity: 0;
    transition: all var(--transition-base);
    z-index: 1000;
    max-width: 400px;
}

.toast.visible {
    transform: translateY(0);
    opacity: 1;
}

.toast.success {
    border-color: var(--color-success);
}

.toast.error {
    border-color: var(--color-error);
}

.toast-icon {
    width: 24px;
    height: 24px;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.toast.success .toast-icon {
    background: var(--color-success);
}

.toast.success .toast-icon::before {
    content: '✓';
    color: white;
    font-size: 14px;
    font-weight: bold;
}

.toast.error .toast-icon {
    background: var(--color-error);
}

.toast.error .toast-icon::before {
    content: '✕';
    color: white;
    font-size: 14px;
    font-weight: bold;
}

.toast-message {
    font-size: var(--font-size-sm);
    color: var(--color-text);
}

/* ========================================
   Responsive Adjustments
======================================== */
@media (max-width: 640px) {
    .container {
        padding: var(--spacing-md);
    }

    .header {
        padding: var(--spacing-2xl) 0 var(--spacing-xl);
    }

    .logo h1 {
        font-size: var(--font-size-2xl);
    }

    .tagline {
        font-size: var(--font-size-base);
    }

    .drop-zone {
        min-height: 200px;
        padding: var(--spacing-xl);
    }

    .results-header {
        flex-direction: column;
        gap: var(--spacing-md);
        text-align: center;
    }
}

/* ========================================
   Consent Modal (Apple App Store Compliance)
======================================== */
.consent-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    padding: var(--spacing-md);
}

.consent-modal.visible {
    display: flex;
}

.consent-backdrop {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(10px);
}

.consent-dialog {
    position: relative;
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--spacing-2xl);
    max-width: 480px;
    width: 100%;
    text-align: center;
    box-shadow: var(--shadow-lg);
    animation: modalSlideIn 0.3s ease;
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: translateY(-20px) scale(0.95);
    }

    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.consent-icon {
    width: 72px;
    height: 72px;
    margin: 0 auto var(--spacing-lg);
    background: linear-gradient(135deg, rgba(118, 185, 0, 0.2) 0%, rgba(0, 212, 170, 0.2) 100%);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
}

.consent-icon svg {
    width: 36px;
    height: 36px;
    color: var(--color-primary);
}

.consent-dialog h2 {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    color: var(--color-text);
}

.consent-main-text {
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: var(--spacing-lg);
}

.consent-details {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    text-align: left;
}

.consent-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: var(--font-size-sm);
    color: var(--color-text);
    margin-bottom: var(--spacing-sm);
}

.consent-item:last-child {
    margin-bottom: 0;
}

.consent-item svg {
    width: 18px;
    height: 18px;
    color: var(--color-success);
    flex-shrink: 0;
}

.consent-privacy-link {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-xl);
}

.consent-privacy-link a {
    color: var(--color-primary);
    text-decoration: none;
    font-weight: 500;
}

.consent-privacy-link a:hover {
    text-decoration: underline;
}

.consent-buttons {
    display: flex;
    gap: var(--spacing-md);
}

.consent-btn {
    flex: 1;
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: var(--font-size-base);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-base);
    border: none;
}

.consent-btn-secondary {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    color: var(--color-text-secondary);
}

.consent-btn-secondary:hover {
    background: var(--color-surface-hover);
    border-color: var(--color-border-hover);
    color: var(--color-text);
}

.consent-btn-primary {
    background: var(--gradient-primary);
    color: white;
}

.consent-btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

/* Toast info state for upload messages */
.toast.info {
    border-color: var(--color-primary);
}

.toast.info .toast-icon {
    background: var(--color-primary);
}

.toast.info .toast-icon::before {
    content: 'ℹ';
    color: white;
    font-size: 14px;
    font-weight: bold;
}

@media (max-width: 480px) {
    .consent-dialog {
        padding: var(--spacing-lg);
    }

    .consent-buttons {
        flex-direction: column;
    }

    .consent-btn {
        width: 100%;
    }
}