/* ============================================
   SISTEMA DE GESTIÓN ACADÉMICA
   E.B. Américo Briceño Valero
   Design: Modern & Professional
   ============================================ */

/* --- CSS Variables --- */
:root {
    --primary: #1B2A4A;
    --primary-light: #2C3E6B;
    --primary-lighter: #3A4F8A;
    --secondary: #4A90D9;
    --accent: #00BCD4;
    --success: #27AE60;
    --warning: #F39C12;
    --danger: #E74C3C;
    --info: #3498DB;

    --bg: #F0F2F5;
    --bg-card: #FFFFFF;
    --bg-sidebar: #1B2A4A;
    --text-primary: #2C3E50;
    --text-secondary: #7F8C8D;
    --text-light: #95A5A6;
    --text-white: #FFFFFF;
    --border: #E8ECF1;
    --shadow: 0 2px 12px rgba(0,0,0,0.08);
    --shadow-lg: 0 8px 32px rgba(0,0,0,0.12);
    --radius: 12px;
    --radius-sm: 8px;
    --radius-lg: 16px;
    --transition: all 0.3s ease;
    --sidebar-width: 280px;
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

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

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

/* ============================================
   LOGIN PAGE
   ============================================ */
.login-page {
    background: var(--primary);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.login-container {
    display: flex;
    width: 1000px;
    max-width: 95vw;
    min-height: 600px;
    background: var(--bg-card);
    border-radius: 24px;
    overflow: hidden;
    box-shadow: 0 25px 80px rgba(0,0,0,0.3);
    animation: fadeInUp 0.6s ease;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.login-left {
    flex: 1;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 50%, var(--primary-lighter) 100%);
    padding: 60px 50px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.login-decoration {
    position: absolute;
    inset: 0;
    pointer-events: none;
}

.circle {
    position: absolute;
    border-radius: 50%;
    opacity: 0.08;
}

.c1 {
    width: 400px;
    height: 400px;
    background: var(--secondary);
    top: -150px;
    right: -100px;
    animation: float 8s ease-in-out infinite;
}

.c2 {
    width: 250px;
    height: 250px;
    background: var(--accent);
    bottom: -80px;
    left: -80px;
    animation: float 10s ease-in-out infinite reverse;
}

.c3 {
    width: 150px;
    height: 150px;
    background: var(--secondary);
    top: 50%;
    left: 60%;
    animation: float 12s ease-in-out infinite 2s;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) scale(1); }
    50% { transform: translate(20px, -20px) scale(1.05); }
}

.login-branding {
    position: relative;
    z-index: 1;
}

.brand-icon {
    width: 80px;
    height: 80px;
    background: rgba(255,255,255,0.12);
    border: 2px solid rgba(255,255,255,0.2);
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 30px;
    backdrop-filter: blur(10px);
}

.brand-icon i {
    font-size: 36px;
    color: var(--text-white);
}

.brand-title {
    font-size: 28px;
    font-weight: 800;
    color: var(--text-white);
    line-height: 1.2;
    margin-bottom: 8px;
}

.brand-subtitle {
    font-size: 15px;
    color: rgba(255,255,255,0.7);
    font-weight: 400;
    margin-bottom: 40px;
}

.brand-features {
    display: flex;
    flex-direction: column;
    gap: 14px;
    margin-bottom: 40px;
}

.feature-item {
    display: flex;
    align-items: center;
    gap: 12px;
    color: rgba(255,255,255,0.85);
    font-size: 14px;
    font-weight: 400;
}

.feature-item i {
    color: var(--accent);
    font-size: 18px;
}

.brand-footer {
    font-size: 13px;
    color: rgba(255,255,255,0.4);
    font-style: italic;
}

.login-right {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 50px;
    background: var(--bg-card);
}

.login-form-container {
    width: 100%;
    max-width: 380px;
}

.login-header {
    margin-bottom: 30px;
}

.login-header h2 {
    font-size: 28px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.login-header p {
    font-size: 14px;
    color: var(--text-secondary);
}

.login-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.form-group label {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 8px;
}

.form-group label i {
    color: var(--secondary);
    font-size: 14px;
}

.form-group input {
    padding: 14px 16px;
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-family: inherit;
    transition: var(--transition);
    background: #F8F9FB;
    outline: none;
    width: 100%;
}

.form-group input:focus {
    border-color: var(--secondary);
    background: var(--text-white);
    box-shadow: 0 0 0 4px rgba(74, 144, 217, 0.1);
}

.form-group input::placeholder {
    color: var(--text-light);
}

.password-wrapper {
    position: relative;
}

.password-wrapper input {
    padding-right: 48px;
}

.password-toggle {
    position: absolute;
    right: 4px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    padding: 10px 14px;
    cursor: pointer;
    color: var(--text-light);
    font-size: 16px;
    transition: var(--transition);
}

.password-toggle:hover {
    color: var(--text-primary);
}

.form-options {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.remember-checkbox {
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
    font-size: 13px;
    color: var(--text-secondary);
    user-select: none;
    position: relative;
}

.remember-checkbox input {
    display: none;
}

.checkmark {
    width: 20px;
    height: 20px;
    border: 2px solid var(--border);
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    flex-shrink: 0;
}

.remember-checkbox input:checked ~ .checkmark {
    background: var(--secondary);
    border-color: var(--secondary);
}

.remember-checkbox input:checked ~ .checkmark::after {
    content: '\f00c';
    font-family: 'Font Awesome 6 Free';
    font-weight: 900;
    color: white;
    font-size: 11px;
}

.login-btn {
    padding: 16px 24px;
    background: linear-gradient(135deg, var(--secondary), #357ABD);
    color: white;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 15px;
    font-weight: 600;
    font-family: inherit;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    margin-top: 4px;
}

.login-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(74, 144, 217, 0.35);
}

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

.login-btn:disabled {
    opacity: 0.7;
    cursor: not-allowed;
    transform: none;
}

.login-btn i {
    font-size: 16px;
    transition: var(--transition);
}

.login-btn:hover i {
    transform: translateX(4px);
}

.login-footer {
    margin-top: 30px;
    text-align: center;
}

.login-footer p {
    font-size: 12px;
    color: var(--text-light);
    margin-bottom: 12px;
}

.credentials-hint {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: #F0F7FF;
    border: 1px solid rgba(74, 144, 217, 0.2);
    padding: 10px 16px;
    border-radius: var(--radius-sm);
    font-size: 12px;
    color: var(--secondary);
}

.credentials-hint i {
    font-size: 14px;
}

/* Flash Messages on Login */
.login-form-container .flash-message {
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    margin-bottom: 16px;
    font-size: 13px;
    display: flex;
    align-items: center;
    gap: 10px;
}

/* ============================================
   SIDEBAR
   ============================================ */
.sidebar {
    position: fixed;
    left: 0;
    top: 0;
    width: var(--sidebar-width);
    height: 100vh;
    background: var(--bg-sidebar);
    color: var(--text-white);
    display: flex;
    flex-direction: column;
    z-index: 1000;
    transition: transform 0.3s ease;
    overflow-y: auto;
}

.sidebar::-webkit-scrollbar {
    width: 4px;
}

.sidebar::-webkit-scrollbar-thumb {
    background: rgba(255,255,255,0.15);
    border-radius: 4px;
}

.sidebar-header {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 24px 20px;
    border-bottom: 1px solid rgba(255,255,255,0.08);
}

.sidebar-logo {
    width: 48px;
    height: 48px;
    background: rgba(74, 144, 217, 0.2);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.sidebar-logo i {
    font-size: 24px;
    color: var(--secondary);
}

.sidebar-brand {
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.brand-name {
    font-size: 15px;
    font-weight: 700;
    color: var(--text-white);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.brand-sub {
    font-size: 11px;
    color: rgba(255,255,255,0.5);
    font-weight: 400;
}

.sidebar-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--text-white);
    font-size: 18px;
    cursor: pointer;
    margin-left: auto;
}

.sidebar-nav {
    flex: 1;
    padding: 16px 12px;
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.nav-section-title {
    font-size: 11px;
    font-weight: 600;
    color: rgba(255,255,255,0.35);
    text-transform: uppercase;
    letter-spacing: 1px;
    padding: 16px 12px 8px;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 12px 14px;
    border-radius: var(--radius-sm);
    color: rgba(255,255,255,0.65);
    font-size: 14px;
    font-weight: 500;
    transition: var(--transition);
}

.nav-item i {
    width: 20px;
    text-align: center;
    font-size: 16px;
    flex-shrink: 0;
}

.nav-item:hover {
    background: rgba(255,255,255,0.08);
    color: var(--text-white);
}

.nav-item.active {
    background: rgba(74, 144, 217, 0.2);
    color: var(--secondary);
}

.sidebar-footer {
    padding: 16px 12px;
    border-top: 1px solid rgba(255,255,255,0.08);
}

.sidebar-user {
    display: flex;
    align-items: center;
    gap: 12px;
}

.user-avatar {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--secondary), #357ABD);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    font-weight: 700;
    color: white;
    flex-shrink: 0;
}

.user-avatar.small {
    width: 36px;
    height: 36px;
    font-size: 12px;
    border-radius: 8px;
}

.user-info {
    display: flex;
    flex-direction: column;
    min-width: 0;
    flex: 1;
}

.user-name {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-white);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.user-role {
    font-size: 11px;
    color: rgba(255,255,255,0.45);
}

.logout-btn {
    width: 36px;
    height: 36px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: rgba(255,255,255,0.4);
    transition: var(--transition);
    flex-shrink: 0;
}

.logout-btn:hover {
    background: rgba(231, 76, 60, 0.2);
    color: var(--danger);
}

/* Sidebar Overlay */
.sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.5);
    z-index: 999;
}

/* ============================================
   MAIN CONTENT
   ============================================ */
.main-content {
    margin-left: var(--sidebar-width);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Topbar */
.topbar {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 16px 30px;
    background: var(--bg-card);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
}

.hamburger {
    display: none;
    background: none;
    border: none;
    font-size: 20px;
    color: var(--text-primary);
    cursor: pointer;
    padding: 8px;
}

.topbar-title {
    font-size: 18px;
    font-weight: 700;
    color: var(--text-primary);
    white-space: nowrap;
    flex-shrink: 0;
}

.topbar-right {
    display: flex;
    align-items: center;
    gap: 20px;
    margin-left: auto;
}

.search-box {
    display: flex;
    align-items: center;
    gap: 10px;
    min-width: 0;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 8px 16px;
    transition: var(--transition);
}

.search-box:focus-within {
    border-color: var(--secondary);
    box-shadow: 0 0 0 3px rgba(74, 144, 217, 0.1);
}

.search-box i {
    color: var(--text-light);
    font-size: 14px;
}

.search-input {
    border: none;
    background: none;
    outline: none;
    font-size: 13px;
    font-family: inherit;
    width: 200px;
    min-width: 0;
    max-width: 100%;
    color: var(--text-primary);
}

.search-input::placeholder {
    color: var(--text-light);
}

.topbar-user {
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
    padding: 4px 8px;
    border-radius: var(--radius-sm);
    transition: var(--transition);
}

.topbar-user:hover {
    background: var(--bg);
}

.topbar-user-name {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-primary);
}

/* Flash Messages */
.flash-messages {
    padding: 16px 30px 0;
}

.flash-message {
    padding: 14px 18px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 12px;
    animation: slideInDown 0.3s ease;
}

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

.flash-success {
    background: #E8F8F0;
    border: 1px solid #A3E4C1;
    color: #1E8449;
}

.flash-error {
    background: #FDEDEC;
    border: 1px solid #F5B7B1;
    color: #C0392B;
}

.flash-info {
    background: #EBF5FB;
    border: 1px solid #AED6F1;
    color: #2E86C1;
}

.flash-message i {
    font-size: 18px;
    flex-shrink: 0;
}

.flash-close {
    margin-left: auto;
    background: none;
    border: none;
    font-size: 20px;
    cursor: pointer;
    opacity: 0.5;
    transition: var(--transition);
    padding: 0 4px;
    color: inherit;
}

.flash-close:hover {
    opacity: 1;
}

/* Content */
.content {
    padding: 30px;
    flex: 1;
}

/* ============================================
   WELCOME BANNER
   ============================================ */
.welcome-banner {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    border-radius: var(--radius-lg);
    padding: 36px 40px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 30px;
    position: relative;
    overflow: hidden;
}

.welcome-banner::before {
    content: '';
    position: absolute;
    width: 300px;
    height: 300px;
    background: rgba(74, 144, 217, 0.1);
    border-radius: 50%;
    top: -100px;
    right: -50px;
}

.welcome-banner::after {
    content: '';
    position: absolute;
    width: 200px;
    height: 200px;
    background: rgba(0, 188, 212, 0.08);
    border-radius: 50%;
    bottom: -80px;
    right: 100px;
}

.welcome-text {
    position: relative;
    z-index: 1;
}

.welcome-text h1 {
    font-size: 26px;
    font-weight: 700;
    color: var(--text-white);
    margin-bottom: 6px;
}

.welcome-text p {
    font-size: 14px;
    color: rgba(255,255,255,0.6);
}

.welcome-date {
    display: flex;
    align-items: center;
    gap: 10px;
    color: rgba(255,255,255,0.7);
    font-size: 14px;
    position: relative;
    z-index: 1;
    padding: 10px 18px;
    background: rgba(255,255,255,0.1);
    border-radius: var(--radius-sm);
    backdrop-filter: blur(10px);
}

.welcome-date i {
    font-size: 16px;
}

/* ============================================
   STATS CARDS
   ============================================ */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin-bottom: 36px;
}

.stat-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 24px;
    display: flex;
    align-items: center;
    gap: 18px;
    box-shadow: var(--shadow);
    transition: var(--transition);
    position: relative;
}

.stat-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.stat-icon {
    width: 56px;
    height: 56px;
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.stat-icon i {
    font-size: 24px;
    color: white;
}

.stat-info {
    display: flex;
    flex-direction: column;
    flex: 1;
}

.stat-number {
    font-size: 28px;
    font-weight: 800;
    color: var(--text-primary);
    line-height: 1.1;
}

.stat-label {
    font-size: 13px;
    color: var(--text-secondary);
    font-weight: 500;
}

.stat-trend {
    position: absolute;
    top: 16px;
    right: 16px;
    font-size: 12px;
    font-weight: 600;
    padding: 4px 10px;
    border-radius: 20px;
}

.stat-trend.up {
    background: #E8F8F0;
    color: #27AE60;
}

.stat-trend.down {
    background: #FDEDEC;
    color: #E74C3C;
}

.stat-trend.same {
    background: #F0F2F5;
    color: var(--text-secondary);
}

/* ============================================
   SECTION HEADER
   ============================================ */
.section-header {
    margin-bottom: 20px;
}

.section-header h2 {
    font-size: 20px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.section-header p {
    font-size: 14px;
    color: var(--text-secondary);
}

/* ============================================
   MODULES GRID
   ============================================ */
.modules-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
    margin-bottom: 36px;
}

.module-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 24px;
    display: flex;
    align-items: center;
    gap: 18px;
    box-shadow: var(--shadow);
    transition: var(--transition);
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.module-card::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    width: 4px;
    height: 100%;
    background: var(--card-color, var(--secondary));
    transition: var(--transition);
}

.module-card:hover {
    transform: translateY(-4px) translateX(4px);
    box-shadow: var(--shadow-lg);
}

.module-card:hover::before {
    width: 6px;
}

.module-icon {
    width: 54px;
    height: 54px;
    background: color-mix(in srgb, var(--card-color, var(--secondary)) 15%, white);
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: var(--transition);
}

.module-card:hover .module-icon {
    background: color-mix(in srgb, var(--card-color, var(--secondary)) 25%, white);
}

.module-icon i {
    font-size: 24px;
    color: var(--card-color, var(--secondary));
}

.module-info {
    flex: 1;
    min-width: 0;
}

.module-info h3 {
    font-size: 15px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.module-info p {
    font-size: 12px;
    color: var(--text-secondary);
    line-height: 1.4;
}

.module-arrow {
    color: var(--border);
    font-size: 14px;
    transition: var(--transition);
    flex-shrink: 0;
}

.module-card:hover .module-arrow {
    color: var(--card-color, var(--secondary));
    transform: translateX(4px);
}

/* ============================================
   QUICK ACTIONS
   ============================================ */
.actions-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
}

.action-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    padding: 28px 16px;
    background: var(--bg-card);
    border: 2px dashed var(--border);
    border-radius: var(--radius);
    cursor: pointer;
    transition: var(--transition);
    font-family: inherit;
}

.action-btn:hover {
    border-color: var(--secondary);
    background: #F8FBFF;
    transform: translateY(-2px);
}

.action-btn i {
    font-size: 28px;
    color: var(--secondary);
}

.action-btn span {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-secondary);
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 1100px) {
    .topbar {
        gap: 12px;
        padding: 14px 20px;
    }

    .search-input {
        width: 140px;
    }

    .topbar-user-name {
        display: none;
    }

    .welcome-banner {
        flex-direction: column;
        align-items: flex-start;
        gap: 16px;
        padding: 24px;
    }

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

@media (max-width: 1024px) {
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
    }

    .sidebar.open {
        transform: translateX(0);
    }

    .sidebar-overlay.open {
        display: block;
    }

    .sidebar-toggle {
        display: block;
    }

    .hamburger {
        display: block;
    }

    .main-content {
        margin-left: 0;
    }

    .topbar {
        padding: 12px 16px;
    }

    .content {
        padding: 16px;
    }

    .login-container {
        flex-direction: column;
        max-width: 100%;
        border-radius: 0;
        min-height: 100vh;
    }

    .login-left {
        display: none;
    }

    .login-right {
        padding: 40px 24px;
    }

    .topbar-title {
        font-size: 15px;
    }

    .topbar-user-name {
        display: none;
    }

    .search-input {
        width: 120px;
    }

    .welcome-banner {
        flex-direction: column;
        align-items: flex-start;
        gap: 16px;
        padding: 24px;
    }

    .welcome-text h1 {
        font-size: 20px;
    }

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

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

    .actions-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 480px) {
    .actions-grid {
        grid-template-columns: 1fr;
    }
}

/* ============================================
   PAGE HEADER
   ============================================ */
.page-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 24px;
    gap: 16px;
}

.page-header-text h1 {
    font-size: 24px;
    font-weight: 700;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 10px;
}

.page-header-text h1 i {
    color: var(--secondary);
}

.page-header-text p {
    font-size: 14px;
    color: var(--text-secondary);
    margin-top: 4px;
}

/* ============================================
   BUTTONS
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 600;
    font-family: inherit;
    cursor: pointer;
    transition: var(--transition);
    white-space: nowrap;
}

.btn-primary {
    background: linear-gradient(135deg, var(--secondary), #357ABD);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(74, 144, 217, 0.35);
}

.btn-ghost {
    background: var(--bg);
    color: var(--text-primary);
    border: 1px solid var(--border);
}

.btn-ghost:hover {
    background: var(--border);
}

.btn-sm {
    padding: 6px 14px;
    font-size: 13px;
}

.btn-icon {
    width: 36px;
    height: 36px;
    padding: 0;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    border: none;
    cursor: pointer;
    transition: var(--transition);
    font-size: 15px;
}

.btn-edit {
    background: #EBF5FB;
    color: var(--secondary);
}

.btn-edit:hover {
    background: var(--secondary);
    color: white;
}

.btn-delete {
    background: #FDEDEC;
    color: var(--danger);
}

.btn-delete:hover {
    background: var(--danger);
    color: white;
}

.d-inline {
    display: inline;
}

/* ============================================
   CARD
   ============================================ */
.card {
    background: var(--bg-card);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    margin-bottom: 24px;
    overflow: hidden;
}

.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 24px;
    border-bottom: 1px solid var(--border);
}

.card-header-title {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 15px;
    font-weight: 600;
    color: var(--text-primary);
}

.card-header-title i {
    color: var(--secondary);
}

.card-body {
    padding: 24px;
}

.card-body.p-0 {
    padding: 0;
}

/* ============================================
   FILTER FORM
   ============================================ */
.filter-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 16px;
    margin-bottom: 16px;
}

.filter-actions {
    display: flex;
    gap: 8px;
}

.filter-form .form-group {
    gap: 6px;
}

.filter-form .form-group label {
    font-size: 12px;
    font-weight: 600;
    color: var(--text-secondary);
}

.filter-form .form-group input,
.filter-form .form-group select {
    padding: 8px 12px;
    font-size: 13px;
}

.filter-form .form-group input,
.filter-form .form-group select,
.enrollment-form .form-group input,
.enrollment-form .form-group select,
.enrollment-form .form-group textarea {
    width: 100%;
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    font-family: inherit;
    font-size: 14px;
    transition: var(--transition);
    background: #F8F9FB;
    outline: none;
}

.filter-form .form-group input:focus,
.filter-form .form-group select:focus,
.enrollment-form .form-group input:focus,
.enrollment-form .form-group select:focus,
.enrollment-form .form-group textarea:focus {
    border-color: var(--secondary);
    background: var(--text-white);
    box-shadow: 0 0 0 4px rgba(74, 144, 217, 0.1);
}

/* ============================================
   TABLE
   ============================================ */
.table-responsive {
    overflow-x: auto;
}

.table {
    width: 100%;
    border-collapse: collapse;
}

.table th {
    text-align: left;
    padding: 14px 16px;
    font-size: 12px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-secondary);
    background: var(--bg);
    border-bottom: 2px solid var(--border);
}

.table td {
    padding: 14px 16px;
    font-size: 14px;
    border-bottom: 1px solid var(--border);
    vertical-align: middle;
}

.table tbody tr:hover {
    background: #F8F9FB;
}

.table tbody tr:last-child td {
    border-bottom: none;
}

.student-name {
    font-weight: 600;
    color: var(--text-primary);
}

.student-meta {
    font-size: 12px;
    color: var(--text-light);
    margin-top: 2px;
}

.cedula {
    font-family: 'Courier New', monospace;
    font-weight: 600;
    color: var(--text-secondary);
    white-space: nowrap;
}

.action-btns {
    display: flex;
    gap: 6px;
}

.badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 24px;
    height: 24px;
    padding: 0 8px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 700;
    background: var(--bg);
    color: var(--text-secondary);
}

.badge-section {
    background: #EBF5FB;
    color: var(--secondary);
    font-weight: 700;
}

.status-badge {
    display: inline-flex;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
}

.status-active {
    background: #E8F8F0;
    color: #27AE60;
}

.status-inactive {
    background: #FDEDEC;
    color: var(--danger);
}

/* ============================================
   EMPTY STATE
   ============================================ */
.empty-state {
    text-align: center;
    padding: 60px 24px;
}

.empty-state i {
    font-size: 64px;
    color: var(--border);
    margin-bottom: 16px;
}

.empty-state h3 {
    font-size: 20px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.empty-state p {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 24px;
}

/* ============================================
   ENROLLMENT FORM
   ============================================ */
.enrollment-form {
    max-width: 900px;
}

.form-section {
    margin-bottom: 28px;
    padding-bottom: 28px;
    border-bottom: 1px solid var(--border);
}

.form-section:last-child {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
}

.form-section-title {
    font-size: 15px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.form-section-title i {
    color: var(--secondary);
}

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
    margin-bottom: 16px;
}

.form-row:last-child {
    margin-bottom: 0;
}

.enrollment-form .form-group label {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 4px;
    margin-bottom: 6px;
}

.required {
    color: var(--danger);
}

.enrollment-form .form-group input,
.enrollment-form .form-group select {
    padding: 12px 14px;
}

.enrollment-form .form-group textarea {
    padding: 12px 14px;
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    font-family: inherit;
    font-size: 14px;
    transition: var(--transition);
    background: #F8F9FB;
    outline: none;
    width: 100%;
    resize: vertical;
    min-height: 60px;
}

.enrollment-form .form-group input::placeholder,
.enrollment-form .form-group textarea::placeholder {
    color: var(--text-light);
}

.form-actions {
    display: flex;
    justify-content: flex-end;
    gap: 12px;
    padding-top: 20px;
    border-top: 1px solid var(--border);
    margin-top: 8px;
}

/* ============================================
   RESPONSIVE ENROLLMENT
   ============================================ */
@media (max-width: 768px) {
    .page-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .page-header-text h1 {
        font-size: 20px;
    }

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

    .form-row {
        grid-template-columns: 1fr;
    }

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

    .form-actions .btn {
        width: 100%;
        justify-content: center;
    }
}

/* ============================================
   BIBLIOTECA — EXTENSIONES
   ============================================ */
.status-muted {
    background: #EEF1F5;
    color: #7F8C8D;
}

.status-overdue {
    background: #FEF5E7;
    color: #D68910;
}

.copies {
    display: flex;
    align-items: baseline;
    gap: 4px;
}

.copies-available {
    font-weight: 700;
    font-size: 16px;
    color: var(--success);
}

.copies-total {
    font-size: 13px;
    color: var(--text-light);
}

.btn-return {
    background: #E8F8F0;
    color: var(--success);
}

.btn-return:hover {
    background: var(--success);
    color: white;
}

.form-hint {
    display: block;
    font-size: 12px;
    color: var(--text-light);
    margin-top: 4px;
}

.flash-warning {
    background: #FEF5E7;
    border: 1px solid #F5CBA7;
    color: #B9770E;
}

.nav-badge {
    margin-left: auto;
    background: var(--danger);
    color: white;
    border-radius: 999px;
    min-width: 20px;
    height: 20px;
    padding: 0 6px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 11px;
    font-weight: 700;
}

.logout-form {
    margin: 0;
}

button.logout-btn {
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
}

.sidebar-logo {
    text-decoration: none;
}

.split-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-bottom: 28px;
}

.detail-layout {
    display: grid;
    grid-template-columns: 320px 1fr;
    gap: 20px;
    align-items: start;
}

.kv {
    display: grid;
    grid-template-columns: 120px 1fr;
    gap: 8px 12px;
    font-size: 14px;
}

.kv dt {
    color: var(--text-secondary);
    font-weight: 600;
}

.detail-status {
    margin-bottom: 16px;
}

.detail-description {
    margin-top: 16px;
    color: var(--text-secondary);
    font-size: 14px;
}

.page-actions,
.export-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.export-actions {
    margin-bottom: 20px;
}

.pagination {
    display: flex;
    justify-content: flex-end;
    align-items: center;
    gap: 12px;
    padding: 16px 20px;
    font-size: 13px;
    color: var(--text-secondary);
}

.row-link {
    color: var(--secondary);
    font-weight: 600;
}

.row-link:hover {
    text-decoration: underline;
}

.note-line {
    max-width: 280px;
    font-size: 12px;
    color: var(--text-light);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.check-line {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    margin-top: 12px;
    font-size: 14px;
    font-weight: 600;
}

.check-line input {
    width: 18px;
    height: 18px;
    margin-top: 2px;
}

.empty-state.compact {
    padding: 32px 20px;
}

.empty-state.compact i {
    font-size: 36px;
}

.table-note {
    padding: 12px 20px 16px;
    font-size: 13px;
    color: var(--text-secondary);
}

.print-only {
    display: none;
}

.error-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--primary);
    padding: 24px;
}

.error-card {
    background: white;
    border-radius: 20px;
    padding: 48px 40px;
    max-width: 460px;
    width: 100%;
    text-align: center;
    box-shadow: var(--shadow-lg);
}

.error-code {
    font-size: 64px;
    font-weight: 800;
    color: var(--secondary);
    line-height: 1;
}

.error-card h1 {
    margin: 8px 0 12px;
    font-size: 24px;
}

.error-card p {
    color: var(--text-secondary);
    margin-bottom: 24px;
}

@media (max-width: 900px) {
    .split-grid,
    .detail-layout {
        grid-template-columns: 1fr;
    }
}

@media print {
    .sidebar,
    .topbar,
    .flash-messages,
    .sidebar-overlay,
    .page-actions,
    .export-actions,
    .btn,
    .action-btns {
        display: none !important;
    }

    .main-content {
        margin-left: 0;
    }

    .content {
        padding: 0;
    }

    .print-only {
        display: block;
        margin-bottom: 16px;
    }

    .card,
    .stat-card {
        box-shadow: none;
        break-inside: avoid;
    }
}