/* ===== Variables ===== */
:root {
    --bluesky-50: #f0f9ff;
    --bluesky-100: #e0f2fe;
    --bluesky-200: #bae6fd;
    --bluesky-300: #7dd3fc;
    --bluesky-400: #38bdf8;
    --bluesky-500: #0ea5e9;
    --bluesky-600: #0284c7;
    --bluesky-700: #0369a1;
    --bluesky-800: #075985;
    --bluesky-900: #0c4a6e;

    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;

    --white: #ffffff;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
}

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

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

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    line-height: 1.6;
    color: var(--gray-800);
    background: var(--gray-50);
    -webkit-font-smoothing: antialiased;
}

a {
    text-decoration: none;
    color: inherit;
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
}

button {
    cursor: pointer;
    border: none;
    background: none;
    font-family: inherit;
}

input, textarea, select {
    font-family: inherit;
    font-size: inherit;
}

main {
    overflow-x: hidden;
    width: 100%;
    max-width: 100vw;
}

/* ===== Utilities ===== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
    width: 100%;
}

.desktop-only {
    display: none !important;
}

.mobile-only {
    display: block;
}

@media (min-width: 768px) {
    .desktop-only {
        display: flex !important;
    }
    .mobile-only {
        display: none !important;
    }
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    border-radius: 0.5rem;
    font-weight: 500;
    font-size: 0.875rem;
    transition: all 0.2s;
}

.btn-primary {
    background: var(--bluesky-500);
    color: var(--white);
}

.btn-primary:hover {
    background: var(--bluesky-600);
}

.btn-secondary {
    background: var(--gray-100);
    color: var(--gray-700);
}

.btn-secondary:hover {
    background: var(--gray-200);
}

.btn-white {
    background: var(--white);
    color: var(--bluesky-600);
}

.btn-white:hover {
    background: var(--bluesky-50);
}

.btn-block {
    display: block;
    width: 100%;
}

.link {
    color: var(--bluesky-500);
    font-weight: 500;
    font-size: 0.875rem;
}

.link:hover {
    color: var(--bluesky-600);
}

.loading {
    text-align: center;
    padding: 2rem;
    color: var(--gray-500);
}

/* ===== Header ===== */
.header {
    background: var(--white);
    border-bottom: 1px solid var(--gray-100);
    position: sticky;
    top: 0;
    z-index: 100;
    width: 100%;
    max-width: 100vw;
    overflow-x: hidden;
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 4rem;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--gray-900);
}

.logo-icon {
    width: 2rem;
    height: 2rem;
    background: var(--bluesky-500);
    border-radius: 0.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
}

.search-form {
    position: relative;
    flex: 1;
    max-width: 32rem;
    margin: 0 2rem;
}

.search-form input {
    width: 100%;
    padding: 0.625rem 1rem 0.625rem 2.5rem;
    border: 1px solid var(--gray-200);
    border-radius: 0.5rem;
    outline: none;
    transition: all 0.2s;
}

.search-form input:focus {
    border-color: var(--bluesky-500);
    box-shadow: 0 0 0 3px var(--bluesky-100);
}

.search-form button {
    position: absolute;
    left: 0.75rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--gray-400);
}

.mobile-search {
    margin: 0;
    padding: 0 1rem 0.75rem;
    max-width: none;
}

.nav {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.nav > a {
    padding: 0.5rem 0.75rem;
    color: var(--gray-600);
    font-size: 0.875rem;
    font-weight: 500;
}

.nav > a:hover {
    color: var(--bluesky-500);
}

.menu-btn {
    padding: 0.5rem;
    color: var(--gray-600);
}

.mobile-menu {
    padding: 1rem;
    border-top: 1px solid var(--gray-100);
    background: var(--white);
}

@media (min-width: 768px) {
    .mobile-menu {
        display: none;
    }
}

.mobile-menu a {
    display: block;
    padding: 0.75rem;
    color: var(--gray-700);
    border-radius: 0.5rem;
}

.mobile-menu a:hover {
    background: var(--gray-50);
}

.mobile-menu-auth {
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--gray-100);
}

/* ===== Hero ===== */
.hero {
    position: relative;
    background: linear-gradient(135deg,
        rgba(14, 165, 233, 0.95),
        rgba(2, 132, 199, 0.9),
        rgba(3, 105, 161, 0.95));
    color: var(--white);
    padding: 4rem 1rem;
    text-align: center;
    overflow: hidden;
    width: 100%;
    max-width: 100vw;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(circle at 20% 80%, rgba(125, 211, 252, 0.3) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(56, 189, 248, 0.3) 0%, transparent 50%),
        radial-gradient(circle at 40% 40%, rgba(186, 230, 253, 0.2) 0%, transparent 40%);
    pointer-events: none;
}

/* Neural Network Background */
.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    overflow: hidden;
    pointer-events: none;
}

/* Animated Nodes */
.hero-node {
    position: absolute;
    width: 6px;
    height: 6px;
    background: rgba(255, 255, 255, 0.6);
    border-radius: 50%;
    box-shadow: 0 0 10px rgba(255, 255, 255, 0.5);
}

.hero-node:nth-child(1) { top: 10%; left: 15%; animation: nodeFloat 8s ease-in-out infinite; }
.hero-node:nth-child(2) { top: 20%; left: 85%; animation: nodeFloat 10s ease-in-out infinite 1s; }
.hero-node:nth-child(3) { top: 60%; left: 10%; animation: nodeFloat 9s ease-in-out infinite 2s; }
.hero-node:nth-child(4) { top: 80%; left: 80%; animation: nodeFloat 11s ease-in-out infinite 0.5s; }
.hero-node:nth-child(5) { top: 30%; left: 50%; animation: nodeFloat 7s ease-in-out infinite 1.5s; }
.hero-node:nth-child(6) { top: 70%; left: 40%; animation: nodeFloat 12s ease-in-out infinite 3s; }
.hero-node:nth-child(7) { top: 45%; left: 90%; animation: nodeFloat 8s ease-in-out infinite 2.5s; }
.hero-node:nth-child(8) { top: 85%; left: 25%; animation: nodeFloat 10s ease-in-out infinite 4s; }

/* Connection Lines */
.hero-line {
    position: absolute;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    transform-origin: left center;
}

.hero-line:nth-child(9) { top: 15%; left: 15%; width: 200px; transform: rotate(25deg); animation: linePulse 4s ease-in-out infinite; }
.hero-line:nth-child(10) { top: 25%; left: 40%; width: 150px; transform: rotate(-15deg); animation: linePulse 5s ease-in-out infinite 1s; }
.hero-line:nth-child(11) { top: 65%; left: 20%; width: 180px; transform: rotate(35deg); animation: linePulse 6s ease-in-out infinite 2s; }
.hero-line:nth-child(12) { top: 75%; left: 60%; width: 120px; transform: rotate(-25deg); animation: linePulse 4.5s ease-in-out infinite 0.5s; }
.hero-line:nth-child(13) { top: 40%; left: 70%; width: 160px; transform: rotate(10deg); animation: linePulse 5.5s ease-in-out infinite 1.5s; }

/* Floating Code Tags */
.hero-tag {
    position: absolute;
    padding: 0.25rem 0.5rem;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 4px;
    font-size: 0.625rem;
    font-family: 'Courier New', monospace;
    color: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(4px);
}

.hero-tag:nth-child(14) { top: 15%; left: 5%; animation: tagFloat 15s linear infinite; }
.hero-tag:nth-child(15) { top: 25%; right: 8%; animation: tagFloat 18s linear infinite 3s; }
.hero-tag:nth-child(16) { top: 70%; left: 8%; animation: tagFloat 20s linear infinite 6s; }
.hero-tag:nth-child(17) { top: 80%; right: 5%; animation: tagFloat 16s linear infinite 2s; }
.hero-tag:nth-child(18) { top: 50%; left: 3%; animation: tagFloat 22s linear infinite 8s; }
.hero-tag:nth-child(19) { top: 35%; right: 3%; animation: tagFloat 19s linear infinite 5s; }

/* Animated Circles */
.hero-circle {
    position: absolute;
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: 50%;
}

.hero-circle:nth-child(20) { width: 100px; height: 100px; top: 10%; left: 10%; animation: circleExpand 8s ease-in-out infinite; }
.hero-circle:nth-child(21) { width: 150px; height: 150px; bottom: 15%; right: 10%; animation: circleExpand 10s ease-in-out infinite 2s; }
.hero-circle:nth-child(22) { width: 80px; height: 80px; top: 50%; right: 20%; animation: circleExpand 7s ease-in-out infinite 4s; }

@keyframes nodeFloat {
    0%, 100% { transform: translateY(0) scale(1); opacity: 0.6; }
    50% { transform: translateY(-20px) scale(1.2); opacity: 1; }
}

@keyframes linePulse {
    0%, 100% { opacity: 0.2; }
    50% { opacity: 0.6; }
}

@keyframes tagFloat {
    0% { transform: translateY(0) translateX(0); opacity: 0.5; }
    25% { transform: translateY(-10px) translateX(5px); opacity: 0.8; }
    50% { transform: translateY(0) translateX(10px); opacity: 0.5; }
    75% { transform: translateY(10px) translateX(5px); opacity: 0.8; }
    100% { transform: translateY(0) translateX(0); opacity: 0.5; }
}

@keyframes circleExpand {
    0%, 100% { transform: scale(1); opacity: 0.15; }
    50% { transform: scale(1.1); opacity: 0.3; }
}

/* Ensure content is above background */
.hero > .container {
    position: relative;
    z-index: 1;
}

@media (min-width: 768px) {
    .hero {
        padding: 6rem 0;
    }
}

.hero h1 {
    font-size: 2.5rem;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1rem;
}

.hero h1 span {
    color: var(--bluesky-200);
}

@media (min-width: 768px) {
    .hero h1 {
        font-size: 3.5rem;
    }
}

.hero > .container > p {
    font-size: 1.125rem;
    color: var(--bluesky-100);
    margin-bottom: 2rem;
    max-width: 900px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.6;
}

.hero-search {
    max-width: 60rem;
    margin: 0 auto 1.5rem;
    display: flex;
    gap: 0.5rem;
    background: var(--white);
    padding: 0.5rem;
    border-radius: 0.75rem;
    box-shadow: var(--shadow-lg);
}

.hero-search input {
    flex: 1;
    padding: 0.75rem 1rem;
    border: none;
    outline: none;
    font-size: 1rem;
    border-radius: 0.5rem;
}

.hero-search button {
    padding: 0.75rem 1.5rem;
    background: var(--bluesky-500);
    color: var(--white);
    border-radius: 0.5rem;
    font-weight: 500;
}

.hero-search button:hover {
    background: var(--bluesky-600);
}

.popular-tags {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.5rem;
    font-size: 0.875rem;
}

.popular-tags span {
    color: var(--bluesky-200);
}

.popular-tags a {
    padding: 0.25rem 0.75rem;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 9999px;
}

.popular-tags a:hover {
    background: rgba(255, 255, 255, 0.2);
}

/* ===== Categories ===== */
.categories {
    padding: 3rem 0;
    background: var(--white);
    border-bottom: 1px solid var(--gray-100);
}

.categories-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
}

@media (min-width: 768px) {
    .categories-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

.category-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 1.5rem;
    background: var(--white);
    border: 1px solid var(--gray-100);
    border-radius: 0.75rem;
    transition: all 0.2s;
}

.category-card:hover {
    border-color: var(--bluesky-200);
    box-shadow: var(--shadow-md);
}

.category-icon {
    width: 3rem;
    height: 3rem;
    border-radius: 0.75rem;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    margin-bottom: 0.75rem;
}

.category-card span {
    font-weight: 500;
    color: var(--gray-900);
}

/* ===== Sections ===== */
.section {
    padding: 4rem 0;
}

.section-alt {
    background: var(--gray-50);
}

.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 2rem;
}

.section-header h2 {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--gray-900);
}

.section-header h2 svg {
    color: var(--bluesky-500);
}

/* ===== Publications Grid ===== */
.publications-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
}

@media (min-width: 640px) {
    .publications-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .publications-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* ===== Publication Card ===== */
.publication-card {
    background: var(--white);
    border: 1px solid var(--gray-100);
    border-radius: 0.75rem;
    overflow: hidden;
    transition: all 0.2s;
}

.publication-card:hover {
    border-color: var(--bluesky-200);
    box-shadow: var(--shadow-lg);
}

.publication-card img {
    width: 100%;
    height: 12rem;
    object-fit: cover;
}

.publication-card-content {
    padding: 1.25rem;
}

.publication-card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 0.75rem;
}

.publication-type {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    padding: 0.25rem 0.625rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 500;
}

.publication-type.app {
    background: #f3e8ff;
    color: #7c3aed;
}

.publication-type.api {
    background: #dbeafe;
    color: #2563eb;
}

.publication-type.tutorial {
    background: #ffedd5;
    color: #ea580c;
}

.publication-type.article {
    background: #fce7f3;
    color: #db2777;
}

.publication-type.program {
    background: #dcfce7;
    color: #16a34a;
}

.publication-date {
    font-size: 0.75rem;
    color: var(--gray-400);
}

.publication-card h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: 0.5rem;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.publication-card h3:hover {
    color: var(--bluesky-500);
}

.publication-card p {
    font-size: 0.875rem;
    color: var(--gray-600);
    margin-bottom: 1rem;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.publication-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.375rem;
    margin-bottom: 1rem;
}

.publication-tags span {
    padding: 0.25rem 0.5rem;
    background: var(--gray-100);
    color: var(--gray-600);
    border-radius: 0.25rem;
    font-size: 0.75rem;
}

.publication-card-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 1rem;
    border-top: 1px solid var(--gray-100);
}

.publication-author {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.publication-author-avatar {
    width: 1.5rem;
    height: 1.5rem;
    border-radius: 9999px;
    background: var(--bluesky-100);
    color: var(--bluesky-600);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.625rem;
    font-weight: 600;
}

.publication-author span {
    font-size: 0.875rem;
    color: var(--gray-600);
}

.publication-stats {
    display: flex;
    align-items: center;
    gap: 1rem;
    font-size: 0.875rem;
    color: var(--gray-400);
}

.publication-stats span {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

/* ===== CTA Section ===== */
.cta {
    background: var(--bluesky-500);
    color: var(--white);
    padding: 5rem 0;
    text-align: center;
}

.cta h2 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.cta p {
    font-size: 1.125rem;
    color: var(--bluesky-100);
    margin-bottom: 2rem;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

/* ===== Footer ===== */
.footer {
    background: var(--gray-900);
    color: var(--white);
    padding: 4rem 0 2rem;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
    margin-bottom: 3rem;
}

@media (min-width: 768px) {
    .footer-grid {
        grid-template-columns: 2fr 1fr 1fr;
    }
}

.footer-brand p {
    color: var(--gray-400);
    margin: 1rem 0;
    max-width: 20rem;
    font-size: 0.875rem;
}

.social-links {
    display: flex;
    gap: 1rem;
}

.social-links a {
    color: var(--gray-400);
    transition: color 0.2s;
}

.social-links a:hover {
    color: var(--bluesky-400);
}

.footer-links h4 {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 1rem;
}

.footer-links ul {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.footer-links a {
    color: var(--gray-400);
    font-size: 0.875rem;
    transition: color 0.2s;
}

.footer-links a:hover {
    color: var(--bluesky-400);
}

.footer-bottom {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    padding-top: 2rem;
    border-top: 1px solid var(--gray-800);
    font-size: 0.875rem;
    color: var(--gray-400);
}

@media (min-width: 768px) {
    .footer-bottom {
        flex-direction: row;
        justify-content: space-between;
    }
}

/* ===== Empty State ===== */
.empty-state {
    text-align: center;
    padding: 4rem 2rem;
}

.empty-state svg {
    width: 4rem;
    height: 4rem;
    color: var(--gray-300);
    margin-bottom: 1rem;
}

.empty-state h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: 0.5rem;
}

.empty-state p {
    color: var(--gray-500);
    margin-bottom: 1.5rem;
}

/* ===== Forms ===== */
.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--gray-700);
    margin-bottom: 0.5rem;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid var(--gray-200);
    border-radius: 0.5rem;
    outline: none;
    transition: all 0.2s;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    border-color: var(--bluesky-500);
    box-shadow: 0 0 0 3px var(--bluesky-100);
}

.form-group textarea {
    resize: vertical;
    min-height: 8rem;
}

/* ===== Alert ===== */
.alert {
    padding: 1rem;
    border-radius: 0.5rem;
    margin-bottom: 1rem;
    font-size: 0.875rem;
}

.alert-error {
    background: #fef2f2;
    border: 1px solid #fecaca;
    color: #dc2626;
}

.alert-success {
    background: #f0fdf4;
    border: 1px solid #bbf7d0;
    color: #16a34a;
}

/* ===== Page Header ===== */
.page-header {
    background: var(--white);
    border-bottom: 1px solid var(--gray-100);
    padding: 2rem 0;
}

.page-header h1 {
    font-size: 1.875rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 0.5rem;
}

.page-header p {
    color: var(--gray-600);
}

/* ===== Filters ===== */
.filters {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    padding: 1rem 0;
}

.filter-group {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.filter-group label {
    font-size: 0.75rem;
    color: var(--gray-500);
}

.filter-group select {
    padding: 0.5rem 0.75rem;
    border: 1px solid var(--gray-200);
    border-radius: 0.5rem;
    font-size: 0.875rem;
    outline: none;
}

.filter-group select:focus {
    border-color: var(--bluesky-500);
}

/* ===== Auth Pages ===== */
.auth-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem 1rem;
    background: var(--gray-50);
}

.auth-container {
    width: 100%;
    max-width: 24rem;
}

.auth-header {
    text-align: center;
    margin-bottom: 2rem;
}

.auth-header h2 {
    font-size: 1.875rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-top: 1.5rem;
    margin-bottom: 0.5rem;
}

.auth-header p {
    color: var(--gray-600);
    font-size: 0.875rem;
}

.auth-box {
    background: var(--white);
    border: 1px solid var(--gray-100);
    border-radius: 0.75rem;
    padding: 2rem;
    box-shadow: var(--shadow-sm);
}

.social-login {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
}

.social-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--gray-200);
    border-radius: 0.5rem;
    font-size: 0.875rem;
    font-weight: 500;
    transition: all 0.2s;
}

.social-btn:hover {
    background: var(--gray-50);
}

.divider {
    display: flex;
    align-items: center;
    margin: 1.5rem 0;
    color: var(--gray-500);
    font-size: 0.875rem;
}

.divider::before,
.divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--gray-200);
}

.divider span {
    padding: 0 1rem;
}

.form-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1rem;
    font-size: 0.875rem;
}

.form-footer label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--gray-600);
}

.form-footer a {
    color: var(--bluesky-500);
}

.form-footer a:hover {
    color: var(--bluesky-600);
}

/* ===== Mobile Responsive Fixes ===== */

/* Tablet Adjustments */
@media (min-width: 768px) and (max-width: 1024px) {
    .hero > .container > p {
        max-width: 700px;
        font-size: 1rem;
    }

    .hero-search {
        max-width: 700px;
        padding: 0.5rem;
    }
}

/* Mobile Header */
@media (max-width: 767px) {
    .header-content {
        height: 3.5rem;
    }

    .mobile-search {
        display: none;
    }

    .mobile-menu {
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.3s ease, padding 0.3s ease;
        padding: 0 1rem;
        border-top: none;
    }

    .mobile-menu.active {
        max-height: 500px;
        padding: 1rem;
        border-top: 1px solid var(--gray-100);
    }

    .mobile-menu.active .mobile-search {
        display: block;
        padding: 0 0 0.75rem 0;
        margin-bottom: 0.5rem;
        border-bottom: 1px solid var(--gray-100);
    }
}

/* Mobile Hero */
@media (max-width: 767px) {
    .hero {
        padding: 2.5rem 0;
    }

    .hero h1 {
        font-size: 1.75rem;
        padding: 0 0.5rem;
    }

    .hero > .container > p {
        font-size: 0.9375rem;
        padding: 0 0.5rem;
        max-width: 100%;
        line-height: 1.5;
    }

    .hero-search {
        flex-direction: column;
        margin: 0 1rem 1.5rem;
        padding: 0.75rem;
        max-width: calc(100% - 2rem);
    }

    .hero-search input {
        width: 100%;
        padding: 0.875rem 1rem;
    }

    .hero-search button {
        width: 100%;
        padding: 0.875rem;
    }

    .popular-tags {
        padding: 0 1rem;
        font-size: 0.75rem;
        max-width: 100%;
    }

    .popular-tags a {
        padding: 0.25rem 0.5rem;
    }

    /* Hide some hero animations on mobile for performance */
    .hero-tag,
    .hero-circle {
        display: none;
    }
}

/* Mobile Header */
@media (max-width: 767px) {
    .header-content {
        height: 3.5rem;
    }

    .logo {
        font-size: 1.125rem;
    }

    .logo-icon {
        width: 1.75rem;
        height: 1.75rem;
    }
}

/* Mobile Categories */
@media (max-width: 767px) {
    .categories {
        padding: 2rem 0;
    }

    .categories-grid {
        gap: 0.75rem;
    }

    .category-card {
        padding: 1rem;
    }

    .category-icon {
        width: 2.5rem;
        height: 2.5rem;
        margin-bottom: 0.5rem;
    }

    .category-card span {
        font-size: 0.875rem;
    }
}

/* Mobile Sections */
@media (max-width: 767px) {
    .section {
        padding: 2.5rem 0;
    }

    .section-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }

    .section-header h2 {
        font-size: 1.25rem;
    }
}

/* Mobile Publication Cards */
@media (max-width: 767px) {
    .publications-grid {
        gap: 1rem;
    }

    .publication-card img {
        height: 10rem;
    }

    .publication-card-content {
        padding: 1rem;
    }

    .publication-card h3 {
        font-size: 1rem;
    }

    .publication-card p {
        font-size: 0.8125rem;
        -webkit-line-clamp: 2;
    }

    .publication-card-footer {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.75rem;
    }
}

/* Mobile CTA */
@media (max-width: 767px) {
    .cta {
        padding: 3rem 0;
    }

    .cta h2 {
        font-size: 1.5rem;
    }

    .cta p {
        font-size: 1rem;
    }
}

/* Mobile Footer */
@media (max-width: 767px) {
    .footer {
        padding: 2.5rem 0 1.5rem;
    }

    .footer-grid {
        gap: 1.5rem;
        margin-bottom: 2rem;
    }

    .footer-brand p {
        font-size: 0.8125rem;
    }
}

/* Mobile Forms */
@media (max-width: 767px) {
    .form-group {
        margin-bottom: 1.25rem;
    }

    .form-group input,
    .form-group textarea,
    .form-group select {
        padding: 0.875rem 1rem;
        font-size: 16px; /* Prevents zoom on iOS */
    }

    .form-group textarea {
        min-height: 6rem;
    }

    .btn {
        padding: 0.875rem 1.25rem;
        font-size: 0.9375rem;
        width: 100%;
    }
}

/* Mobile Page Header */
@media (max-width: 767px) {
    .page-header {
        padding: 1.5rem 0;
    }

    .page-header h1 {
        font-size: 1.5rem;
    }

    .page-header p {
        font-size: 0.875rem;
    }
}

/* Mobile Filters */
@media (max-width: 767px) {
    .filters {
        flex-direction: column;
        gap: 0.75rem;
    }

    .filter-group {
        width: 100%;
    }

    .filter-group select {
        width: 100%;
        padding: 0.75rem;
        font-size: 16px; /* Prevents zoom on iOS */
    }
}

/* Mobile Auth Pages */
@media (max-width: 767px) {
    .auth-page {
        padding: 1rem;
    }

    .auth-container {
        max-width: 100%;
    }

    .auth-box {
        padding: 1.5rem;
    }

    .auth-header h2 {
        font-size: 1.5rem;
    }
}

/* Mobile Type Grid (Publish Page) */
.type-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.75rem;
}

@media (max-width: 767px) {
    .type-grid {
        grid-template-columns: 1fr;
        gap: 0.5rem;
    }

    .type-btn {
        flex-direction: row;
        justify-content: flex-start;
        gap: 0.75rem;
        padding: 1rem;
    }
}

/* Mobile Form Card */
.form-card {
    background: var(--white);
    border: 1px solid var(--gray-100);
    border-radius: 0.75rem;
    padding: 1.5rem;
    margin-bottom: 1rem;
}

@media (max-width: 767px) {
    .form-card {
        padding: 1rem;
        margin-bottom: 0.75rem;
        border-radius: 0.5rem;
    }
}

/* Mobile Article List */
@media (max-width: 767px) {
    .article-item {
        padding: 1rem;
    }

    .article-title {
        font-size: 1rem;
    }

    .article-authors {
        font-size: 0.8125rem;
    }

    .article-meta {
        font-size: 0.75rem;
        flex-direction: column;
        align-items: flex-start;
        gap: 0.25rem;
    }

    .article-abstract {
        font-size: 0.8125rem;
        -webkit-line-clamp: 2;
    }
}

/* Mobile Article Detail */
@media (max-width: 767px) {
    .article-detail {
        padding: 1rem;
    }

    .article-detail h1 {
        font-size: 1.375rem;
    }

    .citation-box {
        padding: 1rem;
        font-size: 0.8125rem;
    }

    .article-actions {
        flex-direction: column;
        gap: 0.5rem;
    }

    .article-actions .btn {
        width: 100%;
    }
}

/* Mobile Empty State */
@media (max-width: 767px) {
    .empty-state {
        padding: 2.5rem 1rem;
    }

    .empty-state svg {
        width: 3rem;
        height: 3rem;
    }

    .empty-state h3 {
        font-size: 1rem;
    }
}

/* Mobile Search Results */
@media (max-width: 767px) {
    .search-results-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
    }
}

/* Mobile Pagination */
.pagination {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    flex-wrap: wrap;
    padding: 1rem 0;
}

@media (max-width: 767px) {
    .pagination {
        gap: 0.25rem;
    }

    .pagination button,
    .pagination a {
        padding: 0.5rem 0.75rem;
        font-size: 0.8125rem;
        min-width: 2.25rem;
    }
}

/* General Mobile Improvements */
@media (max-width: 767px) {
    /* Better touch targets */
    a, button {
        min-height: 44px;
    }

    /* Prevent horizontal scroll */
    body {
        overflow-x: hidden;
    }

    .container {
        padding: 0 0.75rem;
    }

    /* Fix text sizes */
    html {
        font-size: 15px;
    }
}