/* ===== CSS Variables ===== */
:root {
    --sky-100: #e8f4fd;
    --sky-200: #bee3f8;
    --sky-300: #87ceeb;
    --sky-400: #63b3ed;
    --sky-500: #4299e1;
    --sky-600: #3182ce;
    --sky-700: #1a5276;
    --sky-800: #153d5e;
    --sky-900: #0f2b42;

    --white: #ffffff;
    --gray-50: #f8fafc;
    --gray-100: #f1f5f9;
    --gray-200: #e2e8f0;
    --gray-300: #cbd5e1;
    --gray-400: #94a3b8;
    --gray-500: #64748b;
    --gray-600: #475569;
    --gray-700: #334155;
    --gray-800: #1e293b;

    --green-500: #22c55e;
    --green-100: #dcfce7;
    --red-500: #ef4444;
    --red-100: #fee2e2;
    --amber-500: #f59e0b;
    --amber-100: #fef3c7;
    --blue-100: #dbeafe;

    --radius: 12px;
    --radius-sm: 8px;
    --radius-lg: 16px;
    --shadow: 0 1px 3px rgba(0,0,0,.06), 0 4px 12px rgba(0,0,0,.04);
    --shadow-md: 0 4px 6px rgba(0,0,0,.07), 0 10px 24px rgba(0,0,0,.06);
    --shadow-lg: 0 10px 40px rgba(0,0,0,.1);
    --transition: all 0.2s ease;

    --font: 'DM Sans', -apple-system, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
    --font-arabic: 'Noto Kufi Arabic', 'DM Sans', sans-serif;
}

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

body {
    font-family: var(--font);
    background: linear-gradient(135deg, #4a90b8 0%, #5da4cc 25%, #7dbcdf 50%, #a8d5ec 75%, #d0eaf7 100%);
    background-attachment: fixed;
    min-height: 100vh;
    color: var(--gray-800);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

/* RTL Arabic font */
html[dir="rtl"] body {
    font-family: var(--font-arabic);
}

a { color: var(--sky-600); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--sky-700); }

/* ===== Navbar ===== */
.navbar {
    background: linear-gradient(135deg, #1a3a4a 0%, #1e4d5e 50%, #1a3a4a 100%);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    border-bottom: 1px solid rgba(255,255,255,.1);
    position: sticky;
    top: 0;
    z-index: 100;
    padding: 0 1.5rem;
    box-shadow: 0 2px 12px rgba(0,0,0,.15);
}

.nav-container {
    max-width: 1360px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    height: 60px;
    gap: 2rem;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: .6rem;
    font-weight: 700;
    font-size: 1.15rem;
    color: #ffffff;
    white-space: nowrap;
}
.nav-brand i { font-size: 1.3rem; }

.nav-links { display: flex; gap: .25rem; flex: 1; }
.nav-link {
    padding: .5rem .85rem;
    border-radius: var(--radius-sm);
    color: rgba(255,255,255,.8);
    font-size: .9rem;
    font-weight: 500;
    transition: var(--transition);
    white-space: nowrap;
}
.nav-link:hover { background: rgba(255,255,255,.12); color: #ffffff; }
.nav-link.active { background: rgba(255,255,255,.18); color: #ffffff; }
.nav-link i { margin-right: .4rem; }
html[dir="rtl"] .nav-link i { margin-right: 0; margin-left: .4rem; }

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

.lang-switcher { display: flex; gap: .2rem; }
.lang-btn {
    padding: .3rem .5rem;
    border-radius: 6px;
    font-size: .75rem;
    font-weight: 600;
    color: rgba(255,255,255,.6);
    background: transparent;
    transition: var(--transition);
}
.lang-btn:hover { background: rgba(255,255,255,.12); color: #ffffff; }
.lang-btn.active { background: rgba(255,255,255,.25); color: #ffffff; }

.user-menu { display: flex; align-items: center; gap: .5rem; }
.user-name {
    font-size: .85rem;
    color: rgba(255,255,255,.85);
    font-weight: 500;
}
.logout-link { color: rgba(255,255,255,.5) !important; }
.logout-link:hover { color: #fca5a5 !important; }

/* ===== Main Content ===== */
.main-content {
    max-width: 1360px;
    margin: 0 auto;
    padding: 2rem 1.5rem;
}

/* ===== Flash Messages ===== */
.flash-container {
    margin-bottom: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: .5rem;
}
.flash {
    padding: .75rem 1rem;
    border-radius: var(--radius-sm);
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: .9rem;
    font-weight: 500;
    animation: slideDown .3s ease;
}
.flash-success { background: var(--green-100); color: #166534; }
.flash-danger { background: var(--red-100); color: #991b1b; }
.flash-warning { background: var(--amber-100); color: #92400e; }
.flash-info { background: var(--blue-100); color: #1e40af; }
.flash-close {
    background: none; border: none; font-size: 1.2rem;
    cursor: pointer; opacity: .5; color: inherit;
}
.flash-close:hover { opacity: 1; }

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

/* ===== Cards ===== */
.card {
    background: var(--white);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    border: 1px solid rgba(135,206,235,.15);
    overflow: hidden;
    transition: var(--transition);
}
.card:hover { box-shadow: var(--shadow-md); }

.card-header {
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid var(--gray-100);
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.card-header h2, .card-header h3 {
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--sky-700);
}
.card-body { padding: 1.5rem; }

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: .5rem;
    padding: .6rem 1.2rem;
    border-radius: var(--radius-sm);
    font-size: .875rem;
    font-weight: 600;
    font-family: var(--font);
    border: none;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    white-space: nowrap;
}
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }

.btn-primary {
    background: linear-gradient(135deg, var(--sky-500), var(--sky-600));
    color: white;
    box-shadow: 0 2px 8px rgba(66,153,225,.3);
}
.btn-primary:hover { background: linear-gradient(135deg, var(--sky-600), var(--sky-700)); color: white; }

.btn-secondary {
    background: var(--gray-100);
    color: var(--gray-700);
}
.btn-secondary:hover { background: var(--gray-200); color: var(--gray-700); }

.btn-success { background: var(--green-500); color: white; }
.btn-danger { background: var(--red-500); color: white; }
.btn-danger:hover { color: white; }
.btn-outline {
    background: transparent;
    border: 1.5px solid var(--sky-300);
    color: var(--sky-600);
}
.btn-outline:hover { background: var(--sky-50, #f0f9ff); }
.btn-sm { padding: .4rem .75rem; font-size: .8rem; }
.btn-lg { padding: .75rem 1.5rem; font-size: 1rem; }

/* ===== Forms ===== */
.form-group {
    margin-bottom: 1.25rem;
}
.form-label {
    display: block;
    font-size: .85rem;
    font-weight: 600;
    color: var(--gray-700);
    margin-bottom: .4rem;
}
.form-input, .form-select, .form-textarea {
    width: 100%;
    padding: .65rem .9rem;
    border: 1.5px solid var(--gray-200);
    border-radius: var(--radius-sm);
    font-size: .9rem;
    font-family: var(--font);
    color: var(--gray-800);
    background: var(--white);
    transition: var(--transition);
}
.form-input:focus, .form-select:focus, .form-textarea:focus {
    outline: none;
    border-color: var(--sky-400);
    box-shadow: 0 0 0 3px rgba(66,153,225,.15);
}
.form-textarea { resize: vertical; min-height: 100px; }

.form-help {
    font-size: .78rem;
    color: var(--gray-400);
    margin-top: .3rem;
}

/* ===== Toggle Cards (radio selectors) ===== */
.toggle-card {
    cursor: pointer;
    display: block;
}
.toggle-card input[type="radio"] { display: none; }
.toggle-card-body {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: .35rem;
    padding: .85rem .5rem;
    border: 2px solid var(--gray-200);
    border-radius: var(--radius);
    text-align: center;
    transition: var(--transition);
    background: white;
}
.toggle-card-body strong {
    font-size: .85rem;
    color: var(--gray-700);
}
.toggle-card input[type="radio"]:checked + .toggle-card-body {
    border-color: var(--sky-500);
    background: rgba(14, 165, 233, .06);
    box-shadow: 0 0 0 3px rgba(14, 165, 233, .12);
}
.toggle-card input[type="radio"]:checked + .toggle-card-body strong {
    color: var(--sky-700);
}

/* Mini variant for modals */
.toggle-card-mini { cursor: pointer; display: block; }
.toggle-card-mini input[type="radio"] { display: none; }
.toggle-card-mini-body {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: .35rem;
    padding: .45rem .5rem;
    border: 1.5px solid var(--gray-200);
    border-radius: var(--radius-sm);
    font-size: .78rem;
    font-weight: 600;
    color: var(--gray-600);
    background: white;
    transition: var(--transition);
    white-space: nowrap;
}
.toggle-card-mini input[type="radio"]:checked + .toggle-card-mini-body {
    border-color: var(--sky-500);
    background: rgba(14, 165, 233, .08);
    color: var(--sky-700);
    box-shadow: 0 0 0 2px rgba(14, 165, 233, .12);
}

/* ===== Upload Zone ===== */
.upload-zone {
    border: 2px dashed var(--sky-300);
    border-radius: var(--radius);
    padding: 2.5rem;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    background: rgba(135,206,235,.05);
}
.upload-zone:hover, .upload-zone.dragover {
    border-color: var(--sky-500);
    background: rgba(135,206,235,.1);
}
.upload-zone i { font-size: 2.5rem; color: var(--sky-400); margin-bottom: .75rem; }
.upload-zone-text { font-size: .95rem; color: var(--gray-500); }
.upload-zone-file {
    margin-top: .75rem;
    font-weight: 600;
    color: var(--sky-700);
    display: none;
}

/* ===== Stats Cards ===== */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}
.stat-card {
    background: var(--white);
    border-radius: var(--radius);
    padding: 1.25rem;
    box-shadow: var(--shadow);
    border: 1px solid rgba(135,206,235,.15);
    text-align: center;
}
.stat-value {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--sky-700);
    line-height: 1.2;
}
.stat-label {
    font-size: .8rem;
    color: var(--gray-500);
    font-weight: 500;
    margin-top: .25rem;
}

/* ===== Projects Grid ===== */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 1.25rem;
}

.project-card {
    background: var(--white);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    border: 1px solid rgba(135,206,235,.12);
    padding: 1.25rem;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
}
.project-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.project-card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: .75rem;
}
.project-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--gray-800);
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.status-badge {
    display: inline-flex;
    align-items: center;
    gap: .3rem;
    padding: .2rem .6rem;
    border-radius: 20px;
    font-size: .72rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: .03em;
    flex-shrink: 0;
}
.status-pending { background: var(--amber-100); color: #92400e; }
.status-processing { background: var(--blue-100); color: #1e40af; }
.status-completed { background: var(--green-100); color: #166534; }
.status-failed { background: var(--red-100); color: #991b1b; }

.project-meta {
    font-size: .8rem;
    color: var(--gray-500);
    display: flex;
    gap: 1rem;
    margin-bottom: .75rem;
}
.project-meta i { margin-right: .3rem; color: var(--sky-400); }

.project-card-footer {
    margin-top: auto;
    padding-top: .75rem;
    border-top: 1px solid var(--gray-100);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

/* ===== Review Display ===== */
.review-container { display: flex; flex-direction: column; gap: 1.25rem; }

.review-card {
    background: var(--white);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    border: 1px solid rgba(135,206,235,.12);
    overflow: hidden;
}
.review-card-header {
    background: linear-gradient(135deg, rgba(135,206,235,.12), rgba(135,206,235,.04));
    padding: 1rem 1.5rem;
    border-bottom: 1px solid rgba(135,206,235,.12);
}
.review-card-header h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--sky-700);
    margin: 0;
}
.review-card-body {
    padding: 1.25rem 1.5rem;
    font-size: .9rem;
    line-height: 1.75;
    color: var(--gray-700);
}
.review-card-body ul, .review-card-body ol { padding-left: 1.5rem; margin: .5rem 0; }
html[dir="rtl"] .review-card-body ul,
html[dir="rtl"] .review-card-body ol { padding-left: 0; padding-right: 1.5rem; }
.review-card-body li { margin-bottom: .3rem; }
.review-card-body strong { color: var(--gray-800); }
.review-card-body code {
    background: var(--gray-100);
    padding: .15rem .4rem;
    border-radius: 4px;
    font-family: var(--font-mono);
    font-size: .82rem;
}
.review-card-body table {
    width: 100%;
    border-collapse: collapse;
    margin: .75rem 0;
}
.review-card-body th, .review-card-body td {
    padding: .5rem .75rem;
    border: 1px solid var(--gray-200);
    text-align: left;
    font-size: .85rem;
}
html[dir="rtl"] .review-card-body th,
html[dir="rtl"] .review-card-body td { text-align: right; }
.review-card-body th {
    background: var(--sky-100);
    font-weight: 600;
    color: var(--sky-700);
}

/* ===== References Extras (self-citation + chart) ===== */
.refs-extras {
    margin-top: 1.25rem;
    padding-top: 1.25rem;
    border-top: 1px dashed var(--gray-200);
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}
.refs-metrics h4, .refs-chart-container h4 {
    font-size: .9rem;
    font-weight: 600;
    color: var(--sky-700);
    margin-bottom: .75rem;
}
.refs-metrics-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: .75rem;
}
.refs-metric-item {
    background: var(--gray-50);
    border-radius: var(--radius-sm);
    padding: .85rem .75rem;
    text-align: center;
    border: 1px solid var(--gray-100);
}
.refs-metric-value {
    display: block;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--sky-700);
    line-height: 1.2;
}
.refs-metric-label {
    display: block;
    font-size: .75rem;
    font-weight: 500;
    color: var(--gray-500);
    margin-top: .2rem;
}
.refs-chart-container {
    background: var(--gray-50);
    border-radius: var(--radius-sm);
    padding: 1rem;
    border: 1px solid var(--gray-100);
}
.refs-chart-container canvas {
    max-height: 220px;
}

/* ===== Chat Panel ===== */
.chat-panel {
    height: 500px;
    display: flex;
    flex-direction: column;
    background: var(--gray-50);
    border-radius: var(--radius);
    border: 1px solid var(--gray-200);
    overflow: hidden;
}
.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 1rem;
    display: flex;
    flex-direction: column;
    gap: .75rem;
}
.chat-msg {
    max-width: 80%;
    padding: .75rem 1rem;
    border-radius: var(--radius);
    font-size: .88rem;
    line-height: 1.6;
    word-wrap: break-word;
}
.chat-msg.user {
    align-self: flex-end;
    background: linear-gradient(135deg, var(--sky-500), var(--sky-600));
    color: white;
    border-bottom-right-radius: 4px;
}
html[dir="rtl"] .chat-msg.user {
    align-self: flex-start;
    border-bottom-right-radius: var(--radius);
    border-bottom-left-radius: 4px;
}
.chat-msg.assistant {
    align-self: flex-start;
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-bottom-left-radius: 4px;
}
html[dir="rtl"] .chat-msg.assistant {
    align-self: flex-end;
    border-bottom-left-radius: var(--radius);
    border-bottom-right-radius: 4px;
}
.chat-input-area {
    padding: .75rem;
    border-top: 1px solid var(--gray-200);
    display: flex;
    gap: .5rem;
    background: var(--white);
}
.chat-input-area input {
    flex: 1;
    padding: .6rem .9rem;
    border: 1.5px solid var(--gray-200);
    border-radius: var(--radius-sm);
    font-size: .88rem;
    font-family: var(--font);
}
.chat-input-area input:focus {
    outline: none;
    border-color: var(--sky-400);
}

/* ===== Detail Page Layout ===== */
.detail-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 1.5rem;
    gap: 1rem;
    flex-wrap: wrap;
    background: linear-gradient(135deg, #1a3a4a 0%, #1e4d5e 50%, #1a3a4a 100%);
    border-radius: var(--radius-lg);
    padding: 1.5rem 2rem;
    box-shadow: 0 4px 16px rgba(0,0,0,.15);
}
.detail-title-area h1 {
    font-size: 1.5rem;
    font-weight: 700;
    color: #ffffff;
}
.detail-meta {
    display: flex;
    gap: 1.5rem;
    flex-wrap: wrap;
    margin-top: .5rem;
    font-size: .85rem;
    color: rgba(255,255,255,.75);
}
.detail-meta span i { margin-right: .35rem; color: rgba(255,255,255,.5); }

.detail-actions { display: flex; gap: .5rem; flex-wrap: wrap; }

.detail-stats {
    width: 100%;
    display: flex;
    gap: 1.5rem;
    flex-wrap: wrap;
    font-size: .82rem;
    color: rgba(255,255,255,.6);
    padding-top: .75rem;
    border-top: 1px solid rgba(255,255,255,.12);
    margin-top: .25rem;
}
.detail-stats span i { margin-right: .35rem; color: rgba(255,255,255,.4); }

.btn-outline-light {
    border: 1.5px solid rgba(255,255,255,.5) !important;
    color: #ffffff !important;
    background: transparent !important;
}
.btn-outline-light:hover {
    background: rgba(255,255,255,.15) !important;
    border-color: rgba(255,255,255,.8) !important;
}

.detail-grid {
    display: grid;
    grid-template-columns: 1fr 340px;
    gap: 1.5rem;
    align-items: start;
}

@media (max-width: 1024px) {
    .detail-grid { grid-template-columns: 1fr; }
}

.sidebar-card { position: sticky; top: 80px; }

/* ===== Section Nav ===== */
.section-nav {
    display: flex;
    flex-direction: column;
    gap: .25rem;
}
.section-nav a {
    padding: .45rem .75rem;
    border-radius: 6px;
    font-size: .82rem;
    color: var(--gray-600);
    transition: var(--transition);
}
.section-nav a:hover { background: var(--sky-100); color: var(--sky-700); }

/* ===== Admin Table ===== */
.data-table {
    width: 100%;
    border-collapse: collapse;
}
.data-table th, .data-table td {
    padding: .75rem 1rem;
    text-align: left;
    font-size: .875rem;
    border-bottom: 1px solid var(--gray-100);
}
html[dir="rtl"] .data-table th,
html[dir="rtl"] .data-table td { text-align: right; }
.data-table th {
    font-weight: 600;
    color: var(--gray-600);
    font-size: .78rem;
    text-transform: uppercase;
    letter-spacing: .04em;
}
.data-table tr:hover td { background: var(--gray-50); }

/* ===== Landing Page ===== */
.landing-hero {
    text-align: center;
    padding: 5rem 1.5rem 3rem;
}
.landing-hero h1 {
    font-size: 3rem;
    font-weight: 700;
    color: var(--sky-800);
    line-height: 1.15;
    margin-bottom: 1rem;
}
.landing-hero .highlight {
    background: linear-gradient(135deg, var(--sky-500), var(--sky-700));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.landing-hero p {
    font-size: 1.15rem;
    color: var(--gray-500);
    max-width: 600px;
    margin: 0 auto 2rem;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 1.25rem;
    max-width: 1000px;
    margin: 0 auto 3rem;
}
.feature-card {
    background: rgba(255,255,255,.9);
    backdrop-filter: blur(10px);
    border-radius: var(--radius);
    padding: 1.5rem;
    border: 1px solid rgba(135,206,235,.2);
    text-align: center;
}
.feature-card i {
    font-size: 1.75rem;
    color: var(--sky-500);
    margin-bottom: .75rem;
}
.feature-card h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--gray-800);
    margin-bottom: .5rem;
}
.feature-card p { font-size: .85rem; color: var(--gray-500); }

/* ===== Auth Pages ===== */
.auth-container {
    max-width: 420px;
    margin: 4rem auto;
}
.auth-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    padding: 2.5rem;
    border: 1px solid rgba(135,206,235,.15);
}
.auth-card h1 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--sky-700);
    text-align: center;
    margin-bottom: .5rem;
}
.auth-card .subtitle {
    text-align: center;
    color: var(--gray-400);
    font-size: .9rem;
    margin-bottom: 1.5rem;
}
.auth-footer {
    text-align: center;
    margin-top: 1.5rem;
    font-size: .85rem;
    color: var(--gray-500);
}
.auth-footer a { font-weight: 600; }

/* ===== Processing Spinner ===== */
.spinner {
    display: inline-block;
    width: 20px; height: 20px;
    border: 2.5px solid var(--sky-200);
    border-top-color: var(--sky-500);
    border-radius: 50%;
    animation: spin .7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.processing-overlay {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    gap: 1rem;
    padding: 3rem;
    color: var(--gray-500);
}
.processing-overlay .spinner { width: 40px; height: 40px; border-width: 3px; }

/* ===== Pagination ===== */
.pagination {
    display: flex;
    justify-content: center;
    gap: .3rem;
    margin-top: 2rem;
}
.page-link {
    padding: .45rem .75rem;
    border-radius: 6px;
    font-size: .85rem;
    font-weight: 500;
    color: var(--gray-600);
    background: var(--white);
    border: 1px solid var(--gray-200);
    transition: var(--transition);
}
.page-link:hover { background: var(--sky-100); color: var(--sky-700); }
.page-link.active {
    background: var(--sky-500);
    color: white;
    border-color: var(--sky-500);
}
.page-link.disabled { opacity: .4; pointer-events: none; }

/* ===== Search / Filter Bar ===== */
.toolbar {
    display: flex;
    gap: .75rem;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
    align-items: center;
}
.toolbar .form-input { max-width: 300px; }
.filter-chips { display: flex; gap: .3rem; }
.filter-chip {
    padding: .35rem .75rem;
    border-radius: 20px;
    font-size: .8rem;
    font-weight: 500;
    color: var(--gray-600);
    background: var(--white);
    border: 1px solid var(--gray-200);
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
}
.filter-chip:hover { background: var(--sky-100); color: var(--sky-700); }
.filter-chip.active {
    background: var(--sky-500);
    color: white;
    border-color: var(--sky-500);
}

/* ===== Modal ===== */
.modal-backdrop {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,.4);
    z-index: 200;
    align-items: center;
    justify-content: center;
}
.modal-backdrop.active { display: flex; }
.modal {
    background: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    max-width: 500px;
    width: 90%;
    padding: 2rem;
    animation: scaleIn .2s ease;
}
.modal h3 { font-size: 1.1rem; font-weight: 600; margin-bottom: 1rem; color: var(--sky-700); }
@keyframes scaleIn {
    from { transform: scale(.95); opacity: 0; }
    to { transform: scale(1); opacity: 1; }
}

/* ===== Empty State ===== */
.empty-state {
    text-align: center;
    padding: 4rem 1rem;
    color: var(--gray-400);
}
.empty-state i { font-size: 3rem; margin-bottom: 1rem; color: var(--sky-300); }
.empty-state h3 { font-size: 1.1rem; color: var(--gray-600); margin-bottom: .5rem; }

/* ===== Utilities ===== */
.text-center { text-align: center; }
.mt-1 { margin-top: .5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mb-1 { margin-bottom: .5rem; }
.mb-2 { margin-bottom: 1rem; }
.gap-1 { gap: .5rem; }
.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.hidden { display: none; }

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .nav-container { gap: 1rem; }
    .nav-links { display: none; } /* Add hamburger for mobile */
    .landing-hero h1 { font-size: 2rem; }
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
    .projects-grid { grid-template-columns: 1fr; }
    .detail-actions { flex-direction: column; }
    .toolbar { flex-direction: column; }
    .toolbar .form-input { max-width: 100%; }
}