/* CSS Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* CSS Variables for theming */
:root {
    --primary-color: #6366f1;
    --primary-hover: #5855eb;
    --primary-light: #a5b4fc;
    
    /* Light theme colors */
    --bg-color: #ffffff;
    --surface-color: #f8fafc;
    --card-bg: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --border-color: #e2e8f0;
    --shadow-light: rgba(0, 0, 0, 0.1);
    --shadow-medium: rgba(0, 0, 0, 0.15);
    --input-bg: #ffffff;
    --input-border: #d1d5db;
    --input-focus: #6366f1;
    --success-color: #10b981;
    --error-color: #ef4444;
    --warning-color: #f59e0b;
}

/* Dark theme colors */
[data-theme="dark"] {
    --bg-color: #0f172a;
    --surface-color: #1e293b;
    --card-bg: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;
    --border-color: #475569;
    --shadow-light: rgba(0, 0, 0, 0.3);
    --shadow-medium: rgba(0, 0, 0, 0.4);
    --input-bg: #1e293b;
    --input-border: #475569;
    --input-focus: #6366f1;
}

/* Auto theme detection */
@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
        --bg-color: #0f172a;
        --surface-color: #1e293b;
        --card-bg: #334155;
        --text-primary: #f1f5f9;
        --text-secondary: #cbd5e1;
        --text-muted: #94a3b8;
        --border-color: #475569;
        --shadow-light: rgba(0, 0, 0, 0.3);
        --shadow-medium: rgba(0, 0, 0, 0.4);
        --input-bg: #1e293b;
        --input-border: #475569;
        --input-focus: #6366f1;
    }
}

/* Base typography and layout */
html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-color);
    transition: background-color 0.3s ease, color 0.3s ease;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

/* Header Styles */
.header {
    background: var(--card-bg);
    border-bottom: 1px solid var(--border-color);
    box-shadow: 0 1px 3px var(--shadow-light);
    position: sticky;
    top: 0;
    z-index: 100;
    transition: all 0.3s ease;
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    text-decoration: none;
}

.all-tools-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

.all-tools-btn:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
    transform: translateY(-1px);
}

.theme-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 2.5rem;
    height: 2.5rem;
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s ease;
    position: relative;
}

.theme-toggle:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
    transform: translateY(-1px);
}

.sun-icon,
.moon-icon {
    position: absolute;
    transition: all 0.3s ease;
}

[data-theme="dark"] .sun-icon,
:root:not([data-theme="light"]) .sun-icon {
    opacity: 0;
    transform: rotate(180deg);
}

[data-theme="dark"] .moon-icon,
:root:not([data-theme="light"]) .moon-icon {
    opacity: 1;
    transform: rotate(0deg);
}

[data-theme="light"] .sun-icon {
    opacity: 1;
    transform: rotate(0deg);
}

[data-theme="light"] .moon-icon {
    opacity: 0;
    transform: rotate(-180deg);
}

@media (prefers-color-scheme: light) {
    :root:not([data-theme="dark"]) .sun-icon {
        opacity: 1;
        transform: rotate(0deg);
    }
    
    :root:not([data-theme="dark"]) .moon-icon {
        opacity: 0;
        transform: rotate(-180deg);
    }
}

/* Main Content */
.main {
    flex: 1;
    padding: 2rem 0;
}

.hero {
    text-align: center;
    margin-bottom: 3rem;
}

.hero-title {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.7;
}

/* Download Section */
.download-section {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 1rem;
    padding: 2rem;
    box-shadow: 0 4px 6px var(--shadow-light);
    max-width: 600px;
    margin: 0 auto 4rem;
    transition: all 0.3s ease;
}

.download-section:hover {
    box-shadow: 0 8px 25px var(--shadow-medium);
    transform: translateY(-2px);
}

.input-group {
    margin-bottom: 1.5rem;
}

.input-label {
    display: block;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

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

.url-input {
    flex: 1;
    padding: 0.75rem 5.5rem 0.75rem 1rem;
    background: var(--input-bg);
    border: 2px solid var(--input-border);
    border-radius: 0.5rem;
    font-size: 1rem;
    color: var(--text-primary);
    transition: all 0.2s ease;
    outline: none;
}

.url-input:focus {
    border-color: var(--input-focus);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.url-input::placeholder {
    color: var(--text-muted);
}

.paste-btn {
    position: absolute;
    right: 0.5rem;
    top: 50%;
    transform: translateY(-50%);
    background: var(--surface-color);
    border: none;
    border-radius: 0.25rem;
    padding: 0.5rem;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s ease;
}

.paste-btn:hover {
    background: var(--primary-color);
    color: white;
}

.clear-btn {
    position: absolute;
    right: 2.75rem;
    top: 50%;
    transform: translateY(-50%);
    background: var(--surface-color);
    border: none;
    border-radius: 0.25rem;
    padding: 0.5rem;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s ease;
}

.clear-btn:hover {
    background: var(--error-color);
    color: white;
}

.input-help {
    display: block;
    margin-top: 0.5rem;
    color: var(--text-muted);
    font-size: 0.875rem;
}

.format-selection {
    margin-bottom: 2rem;
}

.format-label {
    display: block;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.format-options {
    display: flex;
    gap: 1rem;
}

.format-option {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    padding: 0.75rem 1rem;
    background: var(--surface-color);
    border: 2px solid var(--border-color);
    border-radius: 0.5rem;
    transition: all 0.2s ease;
    flex: 1;
}

.format-option:hover {
    border-color: var(--primary-color);
    background: rgba(99, 102, 241, 0.05);
}

.format-option input[type="radio"] {
    display: none;
}

.format-radio {
    width: 1.25rem;
    height: 1.25rem;
    border: 2px solid var(--border-color);
    border-radius: 50%;
    position: relative;
    transition: all 0.2s ease;
}

.format-option input[type="radio"]:checked + .format-radio {
    border-color: var(--primary-color);
    background: var(--primary-color);
}

.format-option input[type="radio"]:checked + .format-radio::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 0.5rem;
    height: 0.5rem;
    background: white;
    border-radius: 50%;
}

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

.download-btn {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 1rem 2rem;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 0.5rem;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    position: relative;
    overflow: hidden;
}

.download-btn:hover:not(:disabled) {
    background: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.4);
}

.download-btn:disabled {
    background: var(--text-muted);
    cursor: not-allowed;
    transform: none;
}

.download-btn.loading .download-icon,
.download-btn.loading .download-text {
    opacity: 0;
}

.loading-spinner {
    position: absolute;
    width: 1.25rem;
    height: 1.25rem;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top: 2px solid white;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.download-btn.loading .loading-spinner {
    opacity: 1;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.status-message {
    margin-top: 1rem;
    padding: 0.75rem 1rem;
    border-radius: 0.5rem;
    font-weight: 500;
    text-align: center;
    opacity: 0;
    transform: translateY(-10px);
    transition: all 0.3s ease;
}

.status-message.show {
    opacity: 1;
    transform: translateY(0);
}

.status-message.success {
    background: rgba(16, 185, 129, 0.1);
    color: var(--success-color);
    border: 1px solid rgba(16, 185, 129, 0.2);
}

.status-message.error {
    background: rgba(239, 68, 68, 0.1);
    color: var(--error-color);
    border: 1px solid rgba(239, 68, 68, 0.2);
}

.status-message.warning {
    background: rgba(245, 158, 11, 0.1);
    color: var(--warning-color);
    border: 1px solid rgba(245, 158, 11, 0.2);
}

/* Features Section */
.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-bottom: 4rem;
}

.feature {
    text-align: center;
    padding: 2rem;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 1rem;
    transition: all 0.3s ease;
}

.feature:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px var(--shadow-medium);
}

.feature-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 4rem;
    height: 4rem;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    border-radius: 1rem;
    margin-bottom: 1rem;
    color: white;
}

.feature-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.feature-description {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Footer */
.footer {
    background: var(--surface-color);
    border-top: 1px solid var(--border-color);
    padding: 2rem 0;
    text-align: center;
    color: var(--text-secondary);
}

.footer p {
    margin: 0.25rem 0;
}

/* Developer Button */
.developer-btn {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 2rem;
    padding: 0.75rem 1.5rem;
    font-weight: 600;
    cursor: pointer;
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.4);
    transition: all 0.3s ease;
    z-index: 1000;
}

.developer-btn:hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(99, 102, 241, 0.6);
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 0 0.75rem;
    }
    
    .header .container {
        padding: 0.75rem;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .download-section {
        padding: 1.5rem;
        margin: 0 auto 3rem;
    }
    
    .format-options {
        flex-direction: column;
    }
    
    .features {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .feature {
        padding: 1.5rem;
    }
    
    .developer-btn {
        bottom: 1rem;
        right: 1rem;
        padding: 0.5rem 1rem;
        font-size: 0.875rem;
    }
    
    .all-tools-btn {
        padding: 0.375rem 0.75rem;
        font-size: 0.8rem;
    }
    
    .theme-toggle {
        width: 2.25rem;
        height: 2.25rem;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 1.75rem;
    }
    
    .download-section {
        padding: 1rem;
    }
    
    .url-input {
        padding: 0.625rem 4.5rem 0.625rem 0.75rem;
    }
    
    .paste-btn {
        right: 0.375rem;
        padding: 0.375rem;
    }
    
    .clear-btn {
        right: 2.25rem;
        padding: 0.375rem;
    }
    
    .format-option {
        padding: 0.625rem 0.75rem;
    }
    
    .download-btn {
        padding: 0.875rem 1.5rem;
    }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus styles for accessibility */
button:focus-visible,
input:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* Image Preview Modal Styles */
.image-preview-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.image-preview-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(4px);
}

.image-preview-modal {
    position: relative;
    background: var(--card-bg);
    border-radius: 16px;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    max-width: 90vw;
    max-height: 90vh;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    animation: modalSlideIn 0.3s ease-out;
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: scale(0.9) translateY(-20px);
    }
    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

.preview-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 24px;
    border-bottom: 1px solid var(--border-color);
    background: var(--surface-color);
}

.preview-header h3 {
    color: var(--text-primary);
    font-size: 1.25rem;
    font-weight: 600;
    margin: 0;
}

.close-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 24px;
    cursor: pointer;
    padding: 4px 8px;
    border-radius: 4px;
    transition: all 0.2s ease;
}

.close-btn:hover {
    background: var(--border-color);
    color: var(--text-primary);
}

.preview-content {
    padding: 24px;
    overflow-y: auto;
    flex: 1;
}

.preview-content p {
    color: var(--text-secondary);
    margin-bottom: 20px;
    line-height: 1.6;
}

.preview-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 20px;
    margin-bottom: 24px;
}

.preview-item {
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    overflow: hidden;
    transition: all 0.2s ease;
    display: flex;
    flex-direction: column;
}

.preview-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px var(--shadow-medium);
}

.preview-item img {
    width: 100%;
    max-height: 300px;
    object-fit: contain;
    display: block;
    background: var(--surface-alt);
}

.preview-controls {
    padding: 12px;
    margin-top: auto;
}

.download-btn-small {
    width: 100%;
    padding: 8px 12px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 6px;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

.download-btn-small:hover {
    background: var(--primary-hover);
    transform: translateY(-1px);
}

.preview-actions {
    border-top: 1px solid var(--border-color);
    padding-top: 20px;
    text-align: center;
}

.download-all-btn {
    padding: 12px 24px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-hover));
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

.download-all-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(99, 102, 241, 0.4);
}

/* Responsive adjustments for preview modal */
@media (max-width: 768px) {
    .image-preview-modal {
        max-width: 95vw;
        max-height: 95vh;
    }
    
    .preview-grid {
        grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
        gap: 16px;
    }
    
    .preview-item img {
        max-height: 250px;
    }
    
    .preview-header {
        padding: 16px 20px;
    }
    
    .preview-content {
        padding: 20px;
    }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --border-color: currentColor;
        --shadow-light: rgba(0, 0, 0, 0.5);
        --shadow-medium: rgba(0, 0, 0, 0.7);
    }
}

/* Client Download Alert Styles */
.client-download-alert {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 2000;
    animation: fadeIn 0.3s ease-out;
}

.client-download-content {
    background: white;
    padding: 30px;
    border-radius: 15px;
    max-width: 500px;
    width: 90%;
    text-align: center;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    animation: slideIn 0.3s ease-out;
}

.client-download-content h3 {
    color: #405de6;
    margin-bottom: 15px;
    font-size: 1.5em;
}

.client-download-content p {
    color: #666;
    margin-bottom: 20px;
    line-height: 1.6;
}

.client-download-actions {
    display: flex;
    gap: 15px;
    justify-content: center;
    flex-wrap: wrap;
}

.client-download-btn {
    background: linear-gradient(45deg, #405de6, #5851db);
    color: white;
    padding: 12px 24px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    display: inline-block;
    border: none;
    cursor: pointer;
    min-width: 160px;
}

.client-download-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(64, 93, 230, 0.3);
    text-decoration: none;
    color: white;
}

.close-client-download {
    background: #f5f5f5;
    color: #666;
    padding: 12px 24px;
    border-radius: 8px;
    border: none;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    min-width: 100px;
}

.close-client-download:hover {
    background: #e0e0e0;
    transform: translateY(-1px);
}

/* Fallback open alert (manual Instagram open) */
.fallback-open-alert {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1900;
    animation: fadeIn 0.25s ease-out;
}

[data-theme="dark"] .fallback-open-alert .client-download-content {
    background: var(--surface-color);
    color: var(--text-primary);
}

.fallback-open-alert .client-download-content h3 { color: var(--primary-color); }
.fallback-open-alert .client-download-actions .client-download-btn {
    background: linear-gradient(45deg, var(--primary-color), var(--primary-hover));
}
.fallback-open-alert .client-download-actions .close-client-download {
    background: var(--surface-color);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
}
.fallback-open-alert .client-download-actions .close-client-download:hover {
    background: var(--primary-color);
    color: #fff;
    border-color: var(--primary-color);
}

@keyframes slideIn {
    from {
        transform: translateY(-50px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}