/* =====================================================
   YouTube Thumbnail Generator - Modern Dark Theme
   ===================================================== */

/* Root Variables */
:root {
    --primary-red: #FF0000;
    --primary-red-hover: #CC0000;
    --primary-red-light: rgba(255, 0, 0, 0.1);
    --dark-bg: #0F0F0F;
    --dark-bg-secondary: #181818;
    --dark-bg-tertiary: #212121;
    --dark-bg-hover: #2A2A2A;
    --text-primary: #FFFFFF;
    --text-secondary: #AAAAAA;
    --text-tertiary: #717171;
    --border-color: #303030;
    --success-green: #00FF00;
    --error-red: #FF4444;
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
    --shadow-hover: 0 6px 30px rgba(0, 0, 0, 0.7);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    width: 100%;
}

/* =====================================================
   Header
   ===================================================== */

.header {
    background-color: var(--dark-bg-secondary);
    border-bottom: 1px solid var(--border-color);
    padding: 20px 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow);
}

.logo {
    display: flex;
    align-items: center;
    gap: 15px;
}

.logo-icon {
    background: linear-gradient(135deg, var(--primary-red), #CC0000);
    padding: 10px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 15px rgba(255, 0, 0, 0.3);
}

.logo-icon svg {
    color: white;
    width: 32px;
    height: 32px;
}

.logo-text h1 {
    font-size: 28px;
    font-weight: 900;
    letter-spacing: -0.5px;
    color: var(--text-primary);
}

.logo-text .highlight {
    color: var(--primary-red);
}

.tagline {
    font-size: 12px;
    color: var(--text-secondary);
    font-weight: 400;
    margin-top: -2px;
}

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

.main-content {
    flex: 1;
    padding: 40px 0;
}

/* =====================================================
   Feature Tabs
   ===================================================== */

.feature-tabs {
    display: flex;
    gap: 15px;
    margin-bottom: 40px;
    justify-content: center;
    flex-wrap: wrap;
}

.tab-btn {
    background-color: var(--dark-bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    padding: 15px 35px;
    color: var(--text-primary);
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    font-family: 'Roboto', sans-serif;
}

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

.tab-btn.active {
    background: linear-gradient(135deg, var(--primary-red), #CC0000);
    border-color: var(--primary-red);
    color: white;
    box-shadow: 0 4px 15px rgba(255, 0, 0, 0.3);
}

.tab-content {
    display: none;
    animation: fadeIn 0.4s ease-out;
}

.tab-content.active {
    display: block;
}

/* Hero Section */
.hero-section {
    text-align: center;
    margin-bottom: 50px;
    padding: 40px 20px;
    background: linear-gradient(135deg, var(--dark-bg-secondary), var(--dark-bg-tertiary));
    border-radius: 20px;
    border: 1px solid var(--border-color);
}

.hero-title {
    font-size: 42px;
    font-weight: 900;
    line-height: 1.2;
    margin-bottom: 15px;
    background: linear-gradient(135deg, var(--text-primary), var(--text-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 18px;
    color: var(--text-secondary);
    font-weight: 400;
}

/* Section Title */
.section-title {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 20px;
    color: var(--text-primary);
}

/* =====================================================
   Templates Section
   ===================================================== */

.templates-section {
    margin-bottom: 40px;
}

.templates-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 15px;
}

.template-btn {
    background-color: var(--dark-bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    padding: 20px;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    font-family: 'Roboto', sans-serif;
}

.template-btn:hover {
    background-color: var(--dark-bg-hover);
    border-color: var(--primary-red);
    transform: translateY(-3px);
    box-shadow: var(--shadow-hover);
}

.template-btn:active {
    transform: translateY(-1px);
}

.template-emoji {
    font-size: 32px;
}

.template-name {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-primary);
}

/* =====================================================
   Input Section
   ===================================================== */

.input-section {
    margin-bottom: 40px;
}

.input-wrapper {
    position: relative;
}

.prompt-input {
    width: 100%;
    background-color: var(--dark-bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    padding: 20px;
    color: var(--text-primary);
    font-size: 16px;
    font-family: 'Roboto', sans-serif;
    resize: vertical;
    transition: var(--transition);
    min-height: 120px;
}

.prompt-input:focus {
    outline: none;
    border-color: var(--primary-red);
    box-shadow: 0 0 0 3px var(--primary-red-light);
}

.prompt-input::placeholder {
    color: var(--text-tertiary);
}

.input-actions {
    display: flex;
    gap: 10px;
    margin-top: 15px;
    justify-content: flex-end;
}

.char-count {
    margin-top: 8px;
    font-size: 13px;
    color: var(--text-tertiary);
    text-align: right;
}

/* Buttons */
.primary-btn, .secondary-btn {
    padding: 14px 28px;
    border: none;
    border-radius: 8px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-family: 'Roboto', sans-serif;
}

.primary-btn {
    background: linear-gradient(135deg, var(--primary-red), #CC0000);
    color: white;
    box-shadow: 0 4px 15px rgba(255, 0, 0, 0.3);
}

.primary-btn:hover {
    background: linear-gradient(135deg, #FF3333, var(--primary-red));
    box-shadow: 0 6px 20px rgba(255, 0, 0, 0.5);
    transform: translateY(-2px);
}

.primary-btn:active {
    transform: translateY(0);
}

.secondary-btn {
    background-color: var(--dark-bg-tertiary);
    color: var(--text-primary);
    border: 2px solid var(--border-color);
}

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

.primary-btn:disabled, .secondary-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

/* =====================================================
   Loading State
   ===================================================== */

.loading-state {
    text-align: center;
    padding: 60px 20px;
    background-color: var(--dark-bg-secondary);
    border-radius: 12px;
    border: 1px solid var(--border-color);
    margin: 30px 0;
}

.spinner {
    width: 60px;
    height: 60px;
    border: 4px solid var(--border-color);
    border-top-color: var(--primary-red);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 20px;
}

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

.loading-text {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.loading-subtext {
    font-size: 14px;
    color: var(--text-secondary);
}

/* =====================================================
   Error Message
   ===================================================== */

.error-message {
    background-color: rgba(255, 68, 68, 0.1);
    border: 2px solid var(--error-red);
    border-radius: 12px;
    padding: 20px;
    margin: 30px 0;
    display: flex;
    align-items: center;
    gap: 15px;
}

.error-icon {
    font-size: 32px;
}

.error-text {
    color: var(--text-primary);
    font-size: 16px;
}

/* =====================================================
   Result Section
   ===================================================== */

.result-section {
    margin-top: 40px;
}

.result-container {
    background-color: var(--dark-bg-secondary);
    border-radius: 12px;
    padding: 30px;
    border: 1px solid var(--border-color);
}

.thumbnail-wrapper {
    position: relative;
    border-radius: 12px;
    overflow: hidden;
    margin-bottom: 25px;
    box-shadow: var(--shadow);
}

.generated-thumbnail {
    width: 100%;
    height: auto;
    display: block;
    border-radius: 12px;
}

.thumbnail-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(to top, rgba(0, 0, 0, 0.8), transparent);
    padding: 20px;
    opacity: 0;
    transition: var(--transition);
}

.thumbnail-wrapper:hover .thumbnail-overlay {
    opacity: 1;
}

.thumbnail-info {
    display: flex;
    gap: 15px;
}

.thumbnail-size, .thumbnail-format {
    background-color: rgba(255, 255, 255, 0.2);
    padding: 6px 12px;
    border-radius: 6px;
    font-size: 13px;
    font-weight: 600;
    backdrop-filter: blur(10px);
}

.result-actions {
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
}

.download-btn {
    flex: 1;
    justify-content: center;
}

/* =====================================================
   CTR Tips Section
   ===================================================== */

.tips-section {
    margin-top: 30px;
    background: linear-gradient(135deg, var(--dark-bg-secondary), var(--dark-bg-tertiary));
    border-radius: 12px;
    padding: 25px;
    border: 1px solid var(--border-color);
}

.tips-title {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 15px;
    color: var(--text-primary);
}

.tips-list {
    list-style: none;
    display: grid;
    gap: 12px;
}

.tips-list li {
    padding-left: 25px;
    position: relative;
    color: var(--text-secondary);
    font-size: 15px;
    line-height: 1.6;
}

.tips-list li::before {
    content: "→";
    position: absolute;
    left: 0;
    color: var(--primary-red);
    font-weight: bold;
}

.tips-list strong {
    color: var(--text-primary);
    font-weight: 600;
}

/* =====================================================
   Features Section
   ===================================================== */

.features-section {
    margin-top: 60px;
    padding-top: 40px;
    border-top: 1px solid var(--border-color);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 25px;
}

.feature-card {
    background-color: var(--dark-bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 30px;
    text-align: center;
    transition: var(--transition);
}

.feature-card:hover {
    background-color: var(--dark-bg-tertiary);
    border-color: var(--primary-red);
    transform: translateY(-5px);
    box-shadow: var(--shadow-hover);
}

.feature-icon {
    font-size: 48px;
    margin-bottom: 15px;
}

.feature-title {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 10px;
    color: var(--text-primary);
}

.feature-desc {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* =====================================================
   Footer
   ===================================================== */

.footer {
    background-color: var(--dark-bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 30px 0;
    margin-top: 60px;
}

.footer-text {
    text-align: center;
    color: var(--text-secondary);
    font-size: 14px;
}

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

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

.hidden {
    display: none !important;
}

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

@media (max-width: 768px) {
    .hero-title {
        font-size: 32px;
    }

    .hero-subtitle {
        font-size: 16px;
    }

    .logo-text h1 {
        font-size: 22px;
    }

    .templates-grid {
        grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
    }

    .template-btn {
        padding: 15px;
    }

    .template-emoji {
        font-size: 28px;
    }

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

    .input-actions {
        flex-direction: column;
    }

    .primary-btn, .secondary-btn {
        width: 100%;
        justify-content: center;
    }

    .result-actions {
        flex-direction: column;
    }

    .features-grid {
        grid-template-columns: 1fr;
    }

    .result-container {
        padding: 20px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }

    .header {
        padding: 15px 0;
    }

    .hero-section {
        padding: 30px 15px;
    }

    .hero-title {
        font-size: 26px;
    }

    .prompt-input {
        font-size: 14px;
        padding: 15px;
    }

    .tips-section {
        padding: 20px;
    }

    .tips-list li {
        font-size: 14px;
    }
}

/* =====================================================
   Animations
   ===================================================== */

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

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(100px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slideOut {
    from {
        opacity: 1;
        transform: translateX(0);
    }
    to {
        opacity: 0;
        transform: translateX(100px);
    }
}

.result-section, .error-message, .loading-state {
    animation: fadeIn 0.4s ease-out;
}

/* =====================================================
   Platform Selection
   ===================================================== */

.platform-section {
    margin-bottom: 40px;
}

.platform-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 15px;
}

.platform-btn {
    background-color: var(--dark-bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    padding: 25px;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    font-family: 'Roboto', sans-serif;
}

.platform-btn:hover {
    background-color: var(--dark-bg-hover);
    border-color: var(--primary-red);
    transform: translateY(-3px);
    box-shadow: var(--shadow-hover);
}

.platform-btn.active {
    background-color: var(--dark-bg-tertiary);
    border-color: var(--primary-red);
    box-shadow: 0 0 0 3px var(--primary-red-light);
}

.platform-icon {
    font-size: 40px;
}

.platform-name {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
}

/* =====================================================
   URL Input Section
   ===================================================== */

.url-input-section {
    margin-bottom: 40px;
}

.url-input {
    width: 100%;
    background-color: var(--dark-bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    padding: 18px 20px;
    color: var(--text-primary);
    font-size: 16px;
    font-family: 'Roboto', sans-serif;
    transition: var(--transition);
}

.url-input:focus {
    outline: none;
    border-color: var(--primary-red);
    box-shadow: 0 0 0 3px var(--primary-red-light);
}

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

/* =====================================================
   Video Preview
   ===================================================== */

.video-preview {
    background-color: var(--dark-bg-tertiary);
    border-radius: 12px;
    padding: 25px;
    margin-bottom: 25px;
    border: 1px solid var(--border-color);
}

.video-info-item {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 15px;
    padding: 12px;
    background-color: var(--dark-bg-secondary);
    border-radius: 8px;
}

.video-info-label {
    font-weight: 600;
    color: var(--text-secondary);
    min-width: 100px;
}

.video-info-value {
    color: var(--text-primary);
    flex: 1;
}

.video-thumbnail-preview {
    width: 100%;
    max-width: 480px;
    height: auto;
    border-radius: 8px;
    margin: 15px auto;
    display: block;
}

/* =====================================================
   Disclaimer Section
   ===================================================== */

.disclaimer-section {
    margin-top: 30px;
    background: linear-gradient(135deg, rgba(255, 68, 68, 0.1), rgba(255, 0, 0, 0.05));
    border-radius: 12px;
    padding: 25px;
    border: 2px solid rgba(255, 68, 68, 0.3);
}

.disclaimer-title {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 15px;
    color: var(--error-red);
    display: flex;
    align-items: center;
    gap: 8px;
}

.disclaimer-content {
    color: var(--text-secondary);
    font-size: 14px;
    line-height: 1.7;
}

.disclaimer-content p {
    margin-bottom: 12px;
}

.disclaimer-content strong {
    color: var(--text-primary);
    font-weight: 600;
}

.disclaimer-content ul {
    list-style: none;
    margin: 15px 0;
    padding-left: 0;
}

.disclaimer-content li {
    padding: 8px 0 8px 25px;
    position: relative;
    color: var(--text-secondary);
}

.disclaimer-content li::before {
    position: absolute;
    left: 0;
    font-weight: bold;
    font-size: 16px;
}

.disclaimer-note {
    margin-top: 15px;
    padding: 12px;
    background-color: rgba(0, 0, 0, 0.3);
    border-radius: 6px;
    font-style: italic;
    color: var(--text-tertiary);
    font-size: 13px;
}

/* =====================================================
   Caption Generator Styles
   ===================================================== */

.style-section {
    margin-bottom: 40px;
}

.style-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 15px;
}

.style-btn {
    background-color: var(--dark-bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    padding: 20px;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    font-family: 'Roboto', sans-serif;
}

.style-btn:hover {
    background-color: var(--dark-bg-hover);
    border-color: var(--primary-red);
    transform: translateY(-3px);
    box-shadow: var(--shadow-hover);
}

.style-btn.active {
    background-color: var(--dark-bg-tertiary);
    border-color: var(--primary-red);
    box-shadow: 0 0 0 3px var(--primary-red-light);
}

.style-icon {
    font-size: 32px;
}

.style-name {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
}

.caption-card {
    background-color: var(--dark-bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 20px;
    transition: var(--transition);
}

.caption-card:hover {
    border-color: var(--primary-red);
    box-shadow: 0 4px 15px rgba(255, 0, 0, 0.2);
}

.caption-card-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.caption-text {
    background-color: var(--dark-bg-secondary);
    padding: 15px;
    border-radius: 8px;
    font-size: 15px;
    line-height: 1.6;
    color: var(--text-primary);
    min-height: 60px;
    margin-bottom: 12px;
    word-wrap: break-word;
}

.caption-actions {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.hashtags-list {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 15px;
    min-height: 50px;
}

.hashtag-tag {
    background: linear-gradient(135deg, var(--primary-red), #CC0000);
    color: white;
    padding: 8px 15px;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 500;
    display: inline-block;
    transition: var(--transition);
    cursor: pointer;
}

.hashtag-tag:hover {
    transform: scale(1.05);
    box-shadow: 0 4px 12px rgba(255, 0, 0, 0.4);
}

.hashtags-card {
    background: linear-gradient(135deg, var(--dark-bg-tertiary), var(--dark-bg-secondary));
}

/* =====================================================
   Accessibility
   ===================================================== */

:focus-visible {
    outline: 2px solid var(--primary-red);
    outline-offset: 2px;
}

button:focus-visible {
    outline: 3px solid var(--primary-red);
    outline-offset: 3px;
}