/* ==========================================
   VARIABLES & RESET
   ========================================== */

:root {
    /* Colores - Branding Blanco Elegante */
    --color-white: #FFFFFF;
    --color-off-white: #F8FAFB;
    --color-light-gray: #E8EDF2;
    --color-gray: #B8C5D0;
    --color-dark-gray: #647987;
    --color-charcoal: #2C3E50;
    --color-navy: #1A2332;

    /* Azules elegantes */
    --color-blue-50: #EBF5FF;
    --color-blue-100: #D6EBFF;
    --color-blue-200: #A8D4FF;
    --color-blue-300: #6BB5FF;
    --color-blue-500: #2B7DE9;
    --color-blue-600: #1B5FCF;
    --color-blue-700: #154AB5;

    /* Acentos semánticos */
    --color-success: #27AE60;
    --color-success-bg: #EAFAF1;
    --color-danger: #E74C3C;
    --color-danger-bg: #FDEDEC;
    --color-warning: #F39C12;
    --color-warning-bg: #FEF9E7;

    /* Tipografía */
    --font-serif: 'Playfair Display', Georgia, serif;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;

    /* Sombras */
    --shadow-sm: 0 2px 8px rgba(26, 35, 50, 0.05);
    --shadow-md: 0 4px 16px rgba(26, 35, 50, 0.08);
    --shadow-lg: 0 8px 32px rgba(26, 35, 50, 0.12);
    --shadow-xl: 0 16px 48px rgba(26, 35, 50, 0.15);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

body {
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.7;
    color: var(--color-charcoal);
    background-color: #FFFFFF;
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* ==========================================
   TIPOGRAFÍA
   ========================================== */

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-serif);
    color: var(--color-navy);
    font-weight: 600;
    line-height: 1.2;
}

h1 { font-size: 4rem; letter-spacing: -2px; }
h2 { font-size: 2.5rem; letter-spacing: -1px; }
h3 { font-size: 1.5rem; }

p {
    font-size: 1.05rem;
    line-height: 1.7;
}

/* ==========================================
   CURSOR PERSONALIZADO
   ========================================== */

.cursor,
.cursor-follower {
    position: fixed;
    border-radius: 50%;
    pointer-events: none;
    z-index: 9999;
    mix-blend-mode: difference;
}

.cursor {
    width: 10px;
    height: 10px;
    background-color: var(--color-blue-500);
    transform: translate(-50%, -50%);
}

.cursor-follower {
    width: 40px;
    height: 40px;
    border: 2px solid var(--color-blue-500);
    transform: translate(-50%, -50%);
    transition: width 0.3s ease, height 0.3s ease;
}

/* ==========================================
   NAVEGACIÓN
   ========================================== */

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: #FFFFFF;
    border-bottom: 1px solid var(--color-light-gray);
    padding: 1.2rem 0;
    z-index: 1000;
    transition: all 0.3s ease;
    box-shadow: 0 2px 10px rgba(26, 35, 50, 0.03);
}

.navbar.scrolled {
    box-shadow: 0 2px 20px rgba(26, 35, 50, 0.08);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--color-navy);
    letter-spacing: -0.5px;
    display: flex;
    align-items: center;
    gap: 0.6rem;
}

.logo-icon {
    font-size: 1.3rem;
}

.nav-badge {
    padding: 0.4rem 1.2rem;
    background-color: var(--color-blue-50);
    color: var(--color-blue-700);
    font-size: 0.85rem;
    font-weight: 600;
    border-radius: 20px;
    letter-spacing: 0.3px;
}

/* ==========================================
   HERO
   ========================================== */

.hero {
    min-height: 55vh;
    display: flex;
    align-items: center;
    padding-top: 80px;
    position: relative;
    background-color: #FFFFFF;
}

.hero-content {
    max-width: 700px;
}

.hero-greeting {
    font-size: 1.1rem;
    color: var(--color-blue-600);
    font-weight: 500;
    margin-bottom: 1rem;
    letter-spacing: 1px;
    text-transform: uppercase;
    opacity: 0;
    animation: fadeUp 0.6s ease forwards 0.2s;
}

.hero-name {
    font-family: var(--font-serif);
    font-size: 4rem;
    font-weight: 700;
    color: var(--color-navy);
    line-height: 1.1;
    margin-bottom: 1.5rem;
    letter-spacing: -2px;
    opacity: 0;
    animation: fadeUp 0.6s ease forwards 0.4s;
}

.hero-description {
    font-size: 1.15rem;
    color: var(--color-dark-gray);
    line-height: 1.8;
    max-width: 520px;
    opacity: 0;
    animation: fadeUp 0.6s ease forwards 0.6s;
}

.scroll-indicator {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    opacity: 0;
    animation: fadeUp 0.6s ease forwards 1s;
}

.scroll-arrow {
    width: 2px;
    height: 40px;
    background: linear-gradient(to bottom, transparent, var(--color-blue-500));
    animation: scrollBounce 2s infinite;
}

@keyframes scrollBounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(10px); }
}

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

/* ==========================================
   SECCIONES
   ========================================== */

section {
    padding: 5rem 0;
    position: relative;
    z-index: 1;
}

.form-section {
    background-color: var(--color-off-white);
}

.records-section {
    background-color: #FFFFFF;
    padding-bottom: 6rem;
}

.section-header {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    margin-bottom: 3rem;
}

.section-number {
    font-family: var(--font-serif);
    font-size: 1rem;
    color: var(--color-blue-600);
    font-weight: 600;
}

.section-title {
    font-family: var(--font-serif);
    font-size: 2.5rem;
    color: var(--color-navy);
    font-weight: 600;
    letter-spacing: -1px;
}

.section-line {
    flex: 1;
    height: 1px;
    background: linear-gradient(to right, var(--color-blue-200), transparent);
}

/* ==========================================
   FORMULARIO CARD
   ========================================== */

.form-card {
    background-color: var(--color-white);
    border: 1px solid var(--color-light-gray);
    border-radius: 12px;
    padding: 3rem;
    box-shadow: var(--shadow-md);
    position: relative;
    overflow: hidden;
}

.form-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--color-blue-500), var(--color-blue-300), var(--color-blue-600));
}

.form-block {
    margin-bottom: 2.5rem;
}

.form-block-title {
    font-family: var(--font-serif);
    font-size: 1.2rem;
    color: var(--color-navy);
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.7rem;
    font-weight: 600;
}

.form-block-icon {
    font-size: 1.1rem;
}

.note-scale {
    font-family: var(--font-sans);
    font-size: 0.85rem;
    font-weight: 400;
    color: var(--color-dark-gray);
}

.form-row {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}

.form-row-4 {
    grid-template-columns: repeat(4, 1fr);
}

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

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.form-group label {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--color-charcoal);
    letter-spacing: 0.2px;
}

.form-group input {
    padding: 0.9rem 1.1rem;
    border: 2px solid var(--color-light-gray);
    border-radius: 6px;
    font-family: var(--font-sans);
    font-size: 1rem;
    color: var(--color-charcoal);
    background-color: var(--color-white);
    transition: all 0.3s ease;
}

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

.form-group input:focus {
    outline: none;
    border-color: var(--color-blue-500);
    box-shadow: 0 0 0 4px var(--color-blue-50);
}

.form-group input:invalid:not(:placeholder-shown) {
    border-color: var(--color-danger);
}

.input-hint {
    font-size: 0.78rem;
    color: var(--color-gray);
    font-weight: 400;
}

/* Promedio preview en tiempo real */
.promedio-preview {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    padding: 1.2rem 2rem;
    background: linear-gradient(135deg, var(--color-blue-50), var(--color-off-white));
    border: 1px solid var(--color-blue-100);
    border-radius: 8px;
    margin-bottom: 2rem;
    transition: all 0.3s ease;
}

.promedio-preview-label {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--color-dark-gray);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.promedio-preview-value {
    font-family: var(--font-serif);
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-blue-600);
    min-width: 60px;
    text-align: center;
    transition: color 0.3s ease;
}

.promedio-preview-value.aprobado {
    color: var(--color-success);
}

.promedio-preview-value.reprobado {
    color: var(--color-danger);
}

/* ==========================================
   BOTONES
   ========================================== */

.form-actions {
    display: flex;
    gap: 1.5rem;
}

.btn {
    padding: 1rem 2.5rem;
    font-size: 1rem;
    font-weight: 600;
    border-radius: 6px;
    text-decoration: none;
    transition: all 0.3s ease;
    cursor: pointer;
    border: 2px solid transparent;
    letter-spacing: 0.3px;
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    font-family: var(--font-sans);
}

.btn-icon {
    font-size: 1.2rem;
    font-weight: 700;
}

.btn-primary {
    background-color: var(--color-blue-600);
    color: var(--color-white);
    border-color: var(--color-blue-600);
}

.btn-primary:hover {
    background-color: var(--color-blue-700);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

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

.btn-outline {
    background-color: transparent;
    color: var(--color-blue-600);
    border-color: var(--color-blue-600);
}

.btn-outline:hover {
    background-color: var(--color-blue-50);
}

/* ==========================================
   STATS BAR
   ========================================== */

.stats-bar {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
    margin-bottom: 3rem;
}

.stat-item {
    background-color: var(--color-off-white);
    border: 1px solid var(--color-light-gray);
    border-radius: 8px;
    padding: 1.5rem;
    text-align: center;
    transition: all 0.3s ease;
}

.stat-item:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-sm);
}

.stat-value {
    display: block;
    font-family: var(--font-serif);
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-blue-600);
    margin-bottom: 0.3rem;
}

.stat-label {
    font-size: 0.82rem;
    font-weight: 500;
    color: var(--color-dark-gray);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* ==========================================
   ESTADO VACÍO
   ========================================== */

.empty-state {
    text-align: center;
    padding: 4rem 2rem;
    background-color: var(--color-off-white);
    border: 2px dashed var(--color-light-gray);
    border-radius: 12px;
}

.empty-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    opacity: 0.6;
}

.empty-state h3 {
    font-size: 1.3rem;
    margin-bottom: 0.5rem;
    color: var(--color-navy);
}

.empty-state p {
    color: var(--color-dark-gray);
    font-size: 1rem;
}

/* ==========================================
   TABLA
   ========================================== */

.table-wrapper {
    overflow-x: auto;
    border: 1px solid var(--color-light-gray);
    border-radius: 10px;
    box-shadow: var(--shadow-sm);
}

.records-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.95rem;
}

.records-table thead {
    background-color: var(--color-navy);
}

.records-table th {
    padding: 1rem 1.2rem;
    text-align: left;
    font-family: var(--font-sans);
    font-weight: 600;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.8px;
    color: var(--color-blue-200);
    white-space: nowrap;
}

.th-num { width: 50px; text-align: center; }
.th-nota { text-align: center; width: 80px; }
.th-promedio { text-align: center; width: 100px; }
.th-estado { text-align: center; width: 110px; }
.th-action { width: 50px; }

.records-table tbody tr {
    border-bottom: 1px solid var(--color-light-gray);
    transition: all 0.2s ease;
}

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

.records-table tbody tr:hover {
    background-color: var(--color-blue-50);
}

.records-table td {
    padding: 1rem 1.2rem;
    color: var(--color-charcoal);
    vertical-align: middle;
}

.td-num {
    text-align: center;
    font-family: var(--font-serif);
    font-weight: 600;
    color: var(--color-gray);
}

.td-doc {
    font-weight: 500;
    font-size: 0.9rem;
    color: var(--color-dark-gray);
}

.td-name {
    font-weight: 600;
    color: var(--color-navy);
}

.td-curso {
    display: inline-block;
    padding: 0.25rem 0.8rem;
    background-color: var(--color-blue-50);
    color: var(--color-blue-700);
    font-size: 0.85rem;
    font-weight: 600;
    border-radius: 20px;
}

.td-nota {
    text-align: center;
    font-weight: 500;
    font-variant-numeric: tabular-nums;
}

.td-promedio {
    text-align: center;
    font-family: var(--font-serif);
    font-size: 1.2rem;
    font-weight: 700;
}

.td-promedio.aprobado { color: var(--color-success); }
.td-promedio.reprobado { color: var(--color-danger); }

.estado-badge {
    display: inline-block;
    padding: 0.3rem 1rem;
    font-size: 0.8rem;
    font-weight: 600;
    border-radius: 20px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.estado-badge.aprobado {
    background-color: var(--color-success-bg);
    color: var(--color-success);
}

.estado-badge.reprobado {
    background-color: var(--color-danger-bg);
    color: var(--color-danger);
}

.td-estado {
    text-align: center;
}

/* Botón eliminar */
.btn-delete {
    width: 34px;
    height: 34px;
    border-radius: 6px;
    border: 1px solid var(--color-light-gray);
    background-color: var(--color-white);
    color: var(--color-gray);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    transition: all 0.3s ease;
}

.btn-delete:hover {
    background-color: var(--color-danger-bg);
    border-color: var(--color-danger);
    color: var(--color-danger);
    transform: scale(1.1);
}

/* Animación de fila nueva */
.row-new {
    animation: rowSlideIn 0.4s ease forwards;
}

@keyframes rowSlideIn {
    from {
        opacity: 0;
        transform: translateX(-20px);
        background-color: var(--color-blue-50);
    }
    to {
        opacity: 1;
        transform: translateX(0);
        background-color: transparent;
    }
}

/* Animación de eliminación */
.row-removing {
    animation: rowSlideOut 0.3s ease forwards;
}

@keyframes rowSlideOut {
    to {
        opacity: 0;
        transform: translateX(30px);
        max-height: 0;
        padding: 0;
    }
}

/* ==========================================
   TOAST NOTIFICATION
   ========================================== */

.toast {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    background-color: var(--color-navy);
    color: var(--color-white);
    padding: 1rem 1.8rem;
    border-radius: 8px;
    display: flex;
    align-items: center;
    gap: 0.8rem;
    box-shadow: var(--shadow-xl);
    transform: translateY(100px);
    opacity: 0;
    transition: all 0.4s cubic-bezier(0.68, -0.55, 0.265, 1.55);
    z-index: 2000;
    font-weight: 500;
}

.toast.show {
    transform: translateY(0);
    opacity: 1;
}

.toast-icon {
    width: 24px;
    height: 24px;
    background-color: var(--color-success);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.8rem;
    font-weight: 700;
}

.toast.error .toast-icon {
    background-color: var(--color-danger);
}

/* ==========================================
   FOOTER
   ========================================== */

.footer {
    background-color: var(--color-navy);
    color: var(--color-gray);
    padding: 2rem 0;
    text-align: center;
}

.footer-content {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
    font-size: 0.95rem;
}

.footer-year {
    color: var(--color-blue-300);
}

/* ==========================================
   RESPONSIVE
   ========================================== */

@media (max-width: 968px) {
    h1 { font-size: 3rem; }
    h2 { font-size: 2rem; }

    .hero-name { font-size: 3rem; }

    .form-row { grid-template-columns: repeat(2, 1fr); }
    .form-row-2 { grid-template-columns: repeat(2, 1fr); }
    .form-row-4 { grid-template-columns: repeat(2, 1fr); }

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

@media (max-width: 768px) {
    .container { padding: 0 1.5rem; }

    .cursor, .cursor-follower { display: none; }

    .navbar { padding: 1rem 0; }
    .logo { font-size: 1.2rem; }
    .nav-badge { display: none; }

    .hero { min-height: 45vh; padding-top: 90px; }
    .hero-name { font-size: 2.5rem; letter-spacing: -1px; }
    .hero-description { font-size: 1rem; }

    section { padding: 4rem 0; }
    .section-title { font-size: 1.8rem; }
    .section-line { display: none; }

    .form-card { padding: 2rem; }
    .form-row { grid-template-columns: 1fr; }
    .form-row-2 { grid-template-columns: 1fr; }
    .form-row-4 { grid-template-columns: repeat(2, 1fr); }

    .form-actions { flex-direction: column; }
    .btn { justify-content: center; }

    .stats-bar { grid-template-columns: repeat(2, 1fr); gap: 1rem; }
    .stat-value { font-size: 1.5rem; }

    .records-table { font-size: 0.85rem; }
    .records-table th,
    .records-table td { padding: 0.75rem 0.8rem; }
}

@media (max-width: 480px) {
    .container { padding: 0 1rem; }

    h1 { font-size: 2rem; }
    .hero-name { font-size: 2rem; }
    .hero-greeting { font-size: 0.9rem; }

    .form-card { padding: 1.5rem; }
    .form-row-4 { grid-template-columns: 1fr; }
    .form-block-title { font-size: 1.05rem; }

    .promedio-preview { flex-direction: column; gap: 0.3rem; padding: 1rem; }
    .promedio-preview-value { font-size: 1.5rem; }

    .stats-bar { grid-template-columns: 1fr 1fr; gap: 0.8rem; }
    .stat-item { padding: 1rem; }
    .stat-value { font-size: 1.3rem; }

    .footer-content { flex-direction: column; gap: 0.3rem; }
}