/* RSS Aggregator - Custom Styles */
/* Tailwind handles utilities, this file handles complex/custom styles */

:root {
    --bg-light: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #f093fb 100%);
    --bg-dark: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
    --text-dark-mode: #ffffff;
    --text-secondary-dark: #b0b0b0;
    --card-dark: rgba(20, 20, 35, 0.95);
    --border-dark: rgba(255, 255, 255, 0.25);
    --category-color: #667eea;
    --active-category-color: #667eea;
}

/* Animations */
@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes shimmer {
    0% {
        left: -100%;
    }
    100% {
        left: 100%;
    }
}

/* Header */
.header {
    animation: slideDown 0.8s ease-out;
}

.header h1 {
    font-size: 3rem;
    font-weight: 800;
    letter-spacing: -1px;
    background: linear-gradient(135deg, #fff 0%, #f0f0f0 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}

.header p {
    font-size: 1.2em;
    opacity: 0.95;
    font-weight: 500;
    text-shadow: 0 4px 16px rgba(0, 0, 0, 0.2);
}

@media (max-width: 768px) {
    .header h1 {
        font-size: 1.8rem;
    }
}

/* Body backgrounds */
body {
    background: linear-gradient(135deg, var(--category-color) 0%, color-mix(in srgb, var(--category-color) 70%, #764ba2) 50%, color-mix(in srgb, var(--category-color) 50%, #f093fb) 100%);
    background-attachment: fixed;
    transition: background 0.6s cubic-bezier(0.23, 1, 0.320, 1);
}

body.dark-theme {
    background: linear-gradient(135deg, color-mix(in srgb, var(--category-color) 40%, #1a1a2e) 0%, color-mix(in srgb, var(--category-color) 30%, #16213e) 50%, color-mix(in srgb, var(--category-color) 20%, #0f3460) 100%);
    color: var(--text-dark-mode);
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 20% 50%, rgba(255,107,107,0.1) 0%, transparent 50%),
                radial-gradient(circle at 80% 80%, rgba(100,200,255,0.1) 0%, transparent 50%);
    pointer-events: none;
    z-index: 1;
}

/* Article Cards */
.article-card {
    animation: fadeInUp 0.6s ease-out backwards;
    transition: all 0.4s cubic-bezier(0.23, 1, 0.320, 1);
    position: relative;
    overflow: hidden;
}

.article-card:hover {
    transform: translateY(-12px) scale(1.02);
    box-shadow: 0 20px 40px rgba(102, 126, 234, 0.3);
}

body.dark-theme .article-card {
    background: rgba(15, 23, 42, 0.95) !important;
    border-color: rgba(255, 255, 255, 0.15) !important;
}

body.dark-theme .article-card:hover {
    box-shadow: 0 20px 40px rgba(102, 126, 234, 0.2);
    border-color: rgba(255, 255, 255, 0.3) !important;
}

.article-card::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 0.6s ease;
    pointer-events: none;
}

.article-card:hover::before {
    left: 100%;
}

.article-image {
    transition: transform 0.5s cubic-bezier(0.23, 1, 0.320, 1);
}

.article-card:hover .article-image {
    transform: scale(1.1);
}

.article-image.placeholder {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.article-title {
    color: #333;
}

body.dark-theme .article-title {
    color: var(--text-dark-mode);
}

.article-description {
    color: #666;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

body.dark-theme .article-description {
    color: var(--text-secondary-dark);
}

.article-meta {
    color: #999;
}

body.dark-theme .article-meta {
    color: #8a8a8a;
}

/* Search Input */
.search-input {
    background: rgba(255, 255, 255, 0.5);
    transition: all 0.3s cubic-bezier(0.23, 1, 0.320, 1);
}

body.dark-theme .search-input {
    background: rgba(15, 23, 42, 0.8);
    border-color: rgba(255, 255, 255, 0.25) !important;
    color: #ffffff;
}

body.dark-theme .search-input::placeholder {
    color: #a0a0a0;
}

.search-input:focus {
    outline: none;
    border-color: #667eea;
    background: rgba(255, 255, 255, 0.9);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
    transform: scale(1.01);
}

body.dark-theme .search-input:focus {
    background: rgba(255, 255, 255, 0.25);
    border-color: #667eea;
}

/* Tab Styling */
.tabs {
    border-bottom: 2px solid #f0f0f0;
}

body.dark-theme .tabs {
    border-bottom-color: rgba(255, 255, 255, 0.15);
}

.tab-button {
    color: #666;
    transition: all 0.3s cubic-bezier(0.23, 1, 0.320, 1);
    position: relative;
}

body.dark-theme .tab-button {
    color: #a0a0a0;
}

body.dark-theme .tab-button:hover {
    color: #b0b0b0;
}

.tab-button::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 50%;
    width: 0;
    height: 3px;
    background: var(--active-category-color);
    transform: translateX(-50%);
    transition: width 0.3s cubic-bezier(0.23, 1, 0.320, 1);
}

.tab-button:hover::after {
    width: 80%;
}

.tab-button.active {
    color: var(--active-category-color);
}

.tab-button.active::after {
    width: 100%;
}

.tab-button:hover {
    background: rgba(102, 126, 234, 0.05);
}

body.dark-theme .tab-button:hover {
    background: rgba(102, 126, 234, 0.15);
}

/* Tab Content Animation */
.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
    animation: fadeIn 0.3s ease;
}

/* Error Message */
.error {
    background: white;
    border-left: 4px solid #e74c3c;
    color: #e74c3c;
}

body.dark-theme .error {
    background: rgba(231, 76, 60, 0.1);
    border-left-color: #ff6b6b;
    color: #ff6b6b;
}

/* Empty State */
.empty-state {
    background: white;
}

body.dark-theme .empty-state {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-secondary-dark);
}

/* No Results */
.no-results {
    color: #999;
}

body.dark-theme .no-results {
    color: var(--text-secondary-dark);
}

/* Category Colors */
.category-top-news { --category-color: #667eea; }
.category-sport { --category-color: #f85032; }
.category-wirtschaft { --category-color: #00b894; }
.category-politik { --category-color: #e55039; }
.category-oesterreich { --category-color: #0984e3; }
.category-welt { --category-color: #6c5ce7; }
.category-wissenschaft { --category-color: #00cec9; }
.category-wetter { --category-color: #fdcb6e; }

/* Responsive Grid */
.articles-grid {
    grid-template-columns: repeat(5, minmax(0, 1fr));
}

@media (max-width: 1600px) {
    .articles-grid {
        grid-template-columns: repeat(4, minmax(0, 1fr));
    }
}

@media (max-width: 1200px) {
    .articles-grid {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }
}

@media (max-width: 800px) {
    .articles-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

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

    .tab-button {
        padding: 12px 16px;
        font-size: 0.9em;
    }
}