:root {
    --primary: #6366f1;
    --secondary: #06b6d4;
    --accent: #f43f5e;
    --bg-dark: #0f172a;
    --card-bg: rgba(30, 41, 59, 0.7);
    --text-main: #f8fafc;
    --text-dim: #94a3b8;
    --glass-border: rgba(255, 255, 255, 0.1);
    --gradient: linear-gradient(135deg, var(--primary), var(--secondary));
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', sans-serif;
}

h1,
h2,
h3,
.logo-text {
    font-family: 'Outfit', sans-serif;
}

body {
    background-color: var(--bg-dark);
    color: var(--text-main);
    line-height: 1.6;
    overflow-x: hidden;
    min-height: 100vh;
}

.container {
    max-width: 1550px;
    margin: 0 auto;
    padding: 0 2rem;
}

@media (max-width: 600px) {
    .container {
        padding: 0 1rem;
    }
}

/* Header & Nav */
header {
    padding: 1.5rem 0;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 100;
    background: rgba(15, 23, 42, 0.8);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--glass-border);
    transition: all 0.3s ease;
}

@media (max-width: 768px) {
    header {
        backdrop-filter: none;
        background: var(--bg-dark);
    }
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: relative;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.5rem;
    font-weight: 700;
    flex: 1;
}

.logo-icon img {
    height: clamp(28px, 6vw, 32px);
    width: auto;
    display: block;
    object-fit: contain;
}

.logo-text {
    font-size: clamp(1.1rem, 5vw, 1.5rem);
}

.nav-links {
    list-style: none;
    display: flex;
    gap: clamp(0.5rem, 3vw, 2rem);
    align-items: center;
    justify-content: center;
}

.nav-controls {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 0.5rem;
    flex: 1;
}

.nav-links a {
    color: var(--text-dim);
    text-decoration: none;
    transition: color 0.3s;
    font-weight: 500;
    font-size: clamp(0.85rem, 3.5vw, 1rem);
    white-space: nowrap;
}

.nav-links a:hover {
    color: var(--text-main);
}

/* ===== NAV DROPDOWN ===== */
.nav-dropdown {
    position: relative;
}

.nav-dropdown-btn {
    background: transparent;
    border: none;
    cursor: pointer;
    color: var(--text-dim);
    font-weight: 500;
    font-size: clamp(0.85rem, 3.5vw, 1rem);
    display: flex;
    align-items: center;
    gap: 0.3rem;
    padding: 0;
    white-space: nowrap;
    transition: color 0.3s;
    font-family: 'Inter', sans-serif;
}

.nav-dropdown-btn:hover,
.nav-dropdown.open .nav-dropdown-btn {
    color: var(--text-main);
}

.dropdown-arrow {
    transition: transform 0.3s ease;
    flex-shrink: 0;
}

.nav-dropdown.open .dropdown-arrow {
    transform: rotate(180deg);
}

.nav-dropdown-menu {
    list-style: none;
    position: absolute;
    top: calc(100% + 0.75rem);
    right: -60px;
    min-width: 240px;
    background: rgba(15, 23, 42, 0.97);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    padding: 0.5rem;
    display: flex;
    flex-direction: column;
    gap: 0.15rem;
    opacity: 0;
    visibility: hidden;
    transform: translateY(8px);
    transition: opacity 0.25s ease, transform 0.25s ease, visibility 0.25s;
    z-index: 500;
    box-shadow: 0 16px 40px rgba(0, 0, 0, 0.4);
}

@media (min-width: 769px) {

    .nav-dropdown:hover .nav-dropdown-menu,
    .nav-dropdown.open .nav-dropdown-menu {
        opacity: 1;
        visibility: visible;
        transform: translateY(0);
    }
}

.nav-dropdown-menu li a {
    display: block;
    padding: 0.65rem 1rem;
    border-radius: 10px;
    color: var(--text-dim);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    transition: background 0.2s, color 0.2s;
    white-space: nowrap;
}

.nav-dropdown-menu li a:hover,
.nav-dropdown-menu li a.active {
    background: rgba(6, 182, 212, 0.12);
    color: var(--secondary);
}

[data-theme="light"] .nav-dropdown-menu {
    background: rgba(255, 255, 255, 0.98);
    border-color: rgba(14, 165, 233, 0.2);
    box-shadow: 0 16px 40px rgba(0, 0, 0, 0.1);
}

[data-theme="light"] .nav-dropdown-menu li a:hover,
[data-theme="light"] .nav-dropdown-menu li a.active {
    background: rgba(14, 165, 233, 0.1);
    color: #0369a1;
}

[data-theme="light"] .nav-dropdown-btn {
    color: #475569;
}

[data-theme="light"] .nav-dropdown-btn:hover,
[data-theme="light"] .nav-dropdown.open .nav-dropdown-btn {
    color: #0f172a;
}

.logo-text span {
    color: inherit;
}

header .logo-text span {
    color: var(--secondary);
}

/* Hamburger Menu button */
.hamburger {
    display: none;
    flex-direction: column;
    justify-content: space-around;
    width: 2rem;
    height: 1.5rem;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0;
    z-index: 1001;
}

.hamburger span {
    width: 100%;
    height: 2px;
    background: var(--text-main);
    border-radius: 10px;
    transition: all 0.3s linear;
    position: relative;
    transform-origin: 1px;
}

/* Hero Section */
.hero {
    padding: 10rem 0 5rem;
    text-align: center;
    position: relative;

}

.hero h1 {
    font-size: clamp(2.5rem, 8vw, 4.5rem);
    margin-bottom: 1.5rem;
    background: var(--gradient);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    line-height: 1.1;
    letter-spacing: -1px;
}

.hero p {
    color: var(--text-dim);
    font-size: clamp(1rem, 4vw, 1.25rem);
    max-width: 600px;
    margin: 0 auto;
}

@media (max-width: 600px) {
    .hero {
        padding: 7rem 0 3rem;
    }

    .hero h1 {
        font-size: clamp(2rem, 10vw, 2.75rem);
        margin-bottom: 0.75rem;
    }
}

.hero-shapes .shape {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    z-index: -1;
}

.circle-1 {
    width: 300px;
    height: 300px;
    background: var(--primary-glow);
    top: -50px;
    left: -50px;
}

.circle-2 {
    width: 250px;
    height: 250px;
    background: rgba(0, 195, 255, 0.3);
    bottom: 55px;
    right: 60px;
}

@media (max-width: 768px) {
    .hero-shapes .shape {
        filter: blur(40px);
        /* Reduced blur for performance */
        opacity: 0.5;
    }

    .hero {
        padding: 8rem 0 3rem;
    }
}

/* Calculator Section */
.calculator-section {
    padding: 2rem 0 6rem;
}

.glass-card {
    background: var(--card-bg);
    backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border);
    border-radius: 24px;
    padding: 2.5rem;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    transition: all 0.3s ease;
}

@media (max-width: 768px) {
    .glass-card {
        padding: 1.5rem;
        backdrop-filter: none;
        background: rgba(30, 41, 59, 0.95);
        border-radius: 20px;
    }
}

.calculator-card {
    max-width: 700px;
    margin: 0 auto;
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 2rem;
    flex-wrap: wrap;
    gap: 1.5rem;
}

.header-left {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

/* sistema de notas: 0-20, 0-10, 1-7 y 0-100*/
.scale-info {
    font-size: 0.85rem;
    color: var(--text-main);
    font-weight: 500;
}

.scale-info span {
    color: var(--secondary);
    font-weight: 600;
}

/* nota minima para aprobar*/

.threshold-field {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-top: 0.5rem;
}

.threshold-field label {
    font-size: 0.8rem;
    color: var(--text-dim);
}

.threshold-field input {
    width: 60px;
    padding: 0.3rem 0.5rem;
    font-size: 0.85rem;
    text-align: center;
    border-radius: 8px;
}


.selectors-container {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    align-items: flex-end;
}

.mode-selector,
.scale-selector {
    background: rgba(0, 0, 0, 0.2);
    padding: 0.3rem;
    border-radius: 12px;
    display: flex;
    gap: 0.25rem;
    transition: background 0.3s;
}

.scale-selector {
    flex-wrap: wrap;
    justify-content: center;
}

.mode-selector button,
.scale-selector button {
    background: transparent;
    border: none;
    color: var(--text-dim);
    padding: 0.5rem 0.75rem; /* Un poco menos de padding para que entren los 5 */
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s;
    font-weight: 600;
    font-size: 0.85rem;
}

.mode-selector button.active,
.scale-selector button.active {
    background: var(--primary);
    color: white;
}

.mobile-label {
    display: none;
}

.field-name, .field-grade, .field-weight {
    display: contents;
}

/* filas de grado */
.grade-row {
    display: grid;
    grid-template-columns: 1fr 120px 80px 48px;
    gap: 0.75rem;
    margin-bottom: 1rem;
    align-items: center;
    animation: fadeIn 0.4s ease-out forwards;
    position: relative;
    padding: 0.5rem;
    background: rgba(255, 255, 255, 0.03);
    border-radius: 16px;
    transition: background 0.3s;
}

.grade-row:hover {
    background: rgba(255, 255, 255, 0.05);
}

/*tamanios de la fila de examenes ponderado*/
.grade-rows.mode-weighted .grade-row {
    grid-template-columns: 1fr 138px 100px 45px;
}

/*tamanios de la fila de examenes simple */
.grade-rows.mode-simple .grade-row {
    grid-template-columns: 1fr 138px 48px;
}

input {
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--glass-border);
    padding: 0.7rem 0.9rem;
    border-radius: 12px;
    color: white;
    outline: none;
    transition: all 0.3s;
    font-size: 0.95rem;
    width: 100%;
}

input:focus {
    border-color: var(--primary);
    background: rgba(0, 0, 0, 0.5);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
}

input.input-error {
    border-color: var(--accent);
    color: var(--accent);
}

.btn-remove {
    background: rgba(148, 163, 184, 0.1);
    color: #94a3b8;
    border: 1px solid rgba(148, 163, 184, 0.2);
    width: 36px;
    height: 36px;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s;
    display: flex;
    justify-content: center;
    align-items: center;
    justify-self: end;
}

.btn-remove:hover {
    background: #94a3b8;
    color: white;
    transform: scale(1.1);
}

.btn-remove svg {
    stroke-width: 2;
    width: 18px;
    height: 18px;
}

.card-actions {
    margin-top: 1.5rem;
    display: flex;
    gap: 1rem;
}

.btn-outline {
    flex: 1;
    background: transparent;
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--text-dim);
    padding: 0.8rem 1.5rem;
    border-radius: 12px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
}

.btn-outline:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(255, 255, 255, 0.2);
    color: var(--text-main);
}

.btn-secondary {
    flex: 2;
    background: transparent;
    border: 1px dashed var(--text-dim);
    color: var(--text-dim);
    padding: 0.8rem 1.5rem;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.3s;
}

.btn-secondary:hover {
    border-color: var(--primary);
    color: var(--primary);
    background: rgba(99, 102, 241, 0.05);
}

/* Result Area */
.result-container {
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid var(--glass-border);
    text-align: center;
}



.result-box {
    position: relative;
    margin-bottom: 1.5rem;
}

.result-label {
    display: block;
    color: var(--text-dim);
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 0.5rem;
}

.result-value {
    font-size: 4rem;
    font-weight: 800;
    font-family: 'Outfit', sans-serif;
    color: var(--secondary);
    text-shadow: 0 0 20px rgba(6, 182, 212, 0.3);
}


.save-indicator {
    position: absolute;
    top: -15px;
    left: 50%;
    transform: translateX(-50%) translateY(5px);
    font-size: 0.75rem;
    color: #4ade80;
    opacity: 0;
    transition: all 0.3s ease;
    background: rgba(34, 197, 94, 0.15);
    padding: 4px 12px;
    border-radius: 20px;
    white-space: nowrap;
    z-index: 10;
    pointer-events: none;
}

.save-indicator.visible {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

@media (max-width: 600px) {
    .save-indicator {
        top: -10px;
        font-size: 0.7rem;
        padding: 2px 10px;
    }
}

/* Share Actions */
.share-actions {
    display: flex;
    gap: 0.5rem;
    margin-top: 2rem;
    justify-content: center;
    flex-wrap: wrap;
}

.btn-share {
    flex: 1;
    min-width: 120px;
    padding: 0.7rem 1rem;
    border-radius: 12px;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border: 1px solid transparent;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.6rem;
}

.btn-share img {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
    object-fit: contain;
}

.btn-share.whatsapp {
    background: #1eaa51;
    color: white;
}

.btn-share.outline {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--glass-border);
    color: var(--text-main);
}

.btn-share:hover:not(:disabled) {
    transform: translateY(-3px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.3);
    filter: brightness(1.1);
}

.btn-share:disabled,
.btn-secondary:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    pointer-events: none;
    filter: grayscale(0.8);
}

@media (max-width: 480px) {
    .btn-share {
        min-width: calc(50% - 0.5rem);
    }

    .btn-share.whatsapp {
        min-width: 100%;
    }
}

.status-badge {
    display: inline-block;
    padding: 0.4rem 1rem;
    border-radius: 20px;
    font-size: 0.85rem;
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-dim);
}

.status-badge.pass {
    background: rgba(34, 197, 94, 0.1);
    color: #4ade80;
}

.status-badge.fail {
    background: rgba(244, 63, 94, 0.1);
    color: #fb7185;
}

/* Share Guide Toggle */
.share-guide-toggle-container {
    margin-top: 1.5rem;
    display: flex;
    justify-content: center;
}

.btn-guide-toggle {
    background: transparent;
    border: 1px solid rgba(255, 255, 255, 0.15);
    color: var(--text-dim);
    border-radius: 20px;
    padding: 0.5rem 1rem;
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: all 0.3s ease;
}

.btn-guide-toggle:hover {
    background: rgba(255, 255, 255, 0.05);
}

.btn-guide-toggle.active {
    border-color: rgba(99, 102, 241, 0.4);
    color: #a5b4fc;
}

#guide-arrow {
    transition: transform 0.3s ease;
}

.btn-guide-toggle.active #guide-arrow {
    transform: rotate(180deg);
}

/* Share Guide Content */
.share-guide {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1rem;
    margin-top: 0;
    text-align: left;
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    transition: max-height 0.4s ease, opacity 0.3s ease, margin-top 0.3s ease;
}

.share-guide.open {
    max-height: 300px;
    opacity: 1;
    margin-top: 1rem;
}

@media (max-width: 480px) {
    .share-guide.open {
        max-height: 400px;
    }
}

.share-guide-card {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    padding: 1rem;
    display: flex;
    gap: 1rem;
    align-items: flex-start;
    transition: background 0.3s;
}

.share-guide-card:hover {
    background: rgba(255, 255, 255, 0.06);
}

.share-guide-icon {
    flex-shrink: 0;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.share-guide-icon img {
    width: 24px;
    height: 24px;
    object-fit: contain;
}

.share-guide-text h4 {
    font-size: 0.95rem;
    color: var(--text-main);
    margin-bottom: 0.25rem;
    font-weight: 600;
}

.share-guide-text p {
    font-size: 0.8rem;
    color: var(--text-dim);
    line-height: 1.4;
}

@media (max-width: 768px) {
    .result-value {
        font-size: 3rem;
        text-shadow: none;
    }
}

.section-title {
    font-size: clamp(1.75rem, 8vw, 2.5rem);
    text-align: center;
    margin-bottom: 3rem;
    background: var(--gradient);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    font-weight: 800;
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
}

@media (max-width: 600px) {
    .grid {
        gap: 1rem;
    }

    .info-card {
        padding: 1rem;
        background: rgba(255, 255, 255, 0.03);
        border: 1px solid rgba(255, 255, 255, 0.05);
        /* Soft border for glass feel */
        backdrop-filter: blur(4px);
    }
    
    .info-card h3 {
        margin-bottom: 0.6rem;
        font-size: 1.2rem;
    }
    
    .info-card p {
        font-size: 0.95rem;
        line-height: 1.5;
    }

    .info-section {
        padding: 2.5rem 0;
    }
}

.info-card {
    background: rgba(255, 255, 255, 0.02);
    padding: 2rem;
    border-radius: 20px;
    border: 1px solid var(--glass-border);
    transition: all 0.3s ease;
}

.info-card h3 {
    margin-bottom: 1rem;
    color: var(--primary);
}

.info-card p {
    color: var(--text-dim);
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.animate-up {
    animation: fadeIn 0.8s ease-out;
}

.delay-1 {
    animation-delay: 0.2s;
}

@media (max-width: 768px) {
    * {
        animation-duration: 0.3s !important;
        /* Faster animations */
    }

    .hero-shapes .shape {
        animation: none !important;
    }
}

/* Responsive */
@media (max-width: 768px) {

    /* Compact Dropdown Mobile Menu */
    .hamburger {
        display: flex;
        z-index: 1001;
    }

    .nav-links {
        position: absolute;
        top: calc(100% + 12px);
        right: 0;
        left: auto;
        height: auto;
        width: 210px;
        background: rgba(30, 41, 59, 0.98);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        border: 1px solid var(--glass-border);
        border-radius: 24px;
        flex-direction: column;
        padding: 0.6rem;
        gap: 0.1rem;
        z-index: 1000;
        opacity: 0;
        visibility: hidden;
        transform: translateY(10px);
        transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
        overflow: hidden;
    }

    .nav-links.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .nav-links a {
        font-size: 0.92rem;
        padding: 0.7rem 1rem;
        border-radius: 14px;
        width: 100%;
        text-align: center;
        transition: all 0.2s;
        border: 1px solid transparent;
        color: var(--text-dim);
        display: block;
        line-height: 1.2;
        white-space: normal;
    }

    .nav-links a:hover,
    .nav-links a.active {
        background: rgba(6, 182, 212, 0.08);
        color: var(--text-main);
        border-color: rgba(6, 182, 212, 0.1);
    }

    /* Botón "Guía de uso ▾" centrado */
    .nav-dropdown-btn {
        width: 100%;
        padding: 0.7rem 1rem;
        border-radius: 14px;
        border: 1px solid transparent;
        justify-content: center;
        color: var(--text-dim);
        font-size: 0.92rem;
        transition: all 0.2s;
    }

    .nav-dropdown.open .nav-dropdown-btn {
        background: rgba(6, 182, 212, 0.08);
        border-color: rgba(6, 182, 212, 0.15);
        color: var(--text-main);
    }

    /* Submenú de guías también centrado */
    .nav-dropdown-menu {
        position: static;
        opacity: 1;
        visibility: visible;
        transform: none;
        background: transparent;
        border: none;
        box-shadow: none;
        backdrop-filter: none;
        padding: 0;
        margin: 0;
        border-radius: 14px;
        max-height: 0;
        overflow: hidden;
        transition: all 0.4s ease;
        width: 100%;
    }

    .nav-dropdown.open .nav-dropdown-menu {
        max-height: 500px;
        padding-top: 0.2rem;
    }

    .nav-dropdown-menu li a {
        font-size: 0.85rem;
        padding: 0.65rem 0.8rem;
        text-align: center;
        border: none;
        border-radius: 10px;
        margin: 0;
        color: var(--text-dim);
        display: block;
        line-height: 1.3;
        white-space: normal;
    }

    .nav-dropdown-menu li a:hover {
        background: rgba(6, 182, 212, 0.1);
        color: var(--secondary);
    }

    .hamburger.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
        background: var(--secondary);
    }

    .hamburger.active span:nth-child(2) {
        opacity: 0;
    }

    .hamburger.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -6px);
        background: var(--secondary);
    }
}

@media (max-width: 600px) {
    .hero {
        overflow: clip;
        /* Fix: Clip absolute circles from bleeding out */
    }

    .container {
        padding: 0 1rem;
        overflow-x: clip;
        /* Extra safety for mobile containers */
    }

    .grade-rows.mode-weighted .grade-row {
        grid-template-columns: 1fr 1fr 45px;
        grid-template-rows: auto auto;
        gap: 12px 10px;
        padding: 1.5rem;
        margin-bottom: 1.25rem;
        align-items: flex-end;
        background: rgba(255, 255, 255, 0.04);
        border: 1px solid rgba(255, 255, 255, 0.05);
        box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    }

    /*tamaños de la fila de examenes simple */
    .grade-rows.mode-simple .grade-row {
        grid-template-columns: 1fr 45px;
        grid-template-rows: auto auto;
        gap: 8px 10px;
        padding: 1.2rem;
        margin-bottom: 1rem;
        align-items: flex-end;
        background: rgba(255, 255, 255, 0.04);
        border: 1px solid rgba(255, 255, 255, 0.05);
        box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    }

    .mode-simple .field-name {
        margin-bottom: 4px;
    }

    .mode-simple .input-name {
        margin-bottom: 4px;
    }

    [data-theme="light"] .grade-row {
        background: rgba(255, 255, 255, 0.9);
        border: 1px solid rgba(0, 0, 0, 0.06);
        box-shadow: 0 4px 12px rgba(0, 0, 0, 0.03);
    }

    .field-name, .field-grade, .field-weight {
        display: block;
    }

    .input-name {
        background: transparent !important;
        border: none !important;
        padding: 0 !important;
        font-size: 0.75rem !important;
        font-weight: 800 !important;
        text-transform: uppercase;
        color: var(--secondary) !important;
        letter-spacing: 0.08em;
        margin-bottom: 12px;
        height: auto !important;
        border-radius: 0 !important;
        text-align: left;
        opacity: 0.9;
    }

    .input-name:focus {
        box-shadow: none !important;
        border-bottom: 1px solid var(--secondary) !important;
        opacity: 1;
    }

    [data-theme="light"] .input-name {
        color: #0369a1 !important;
    }

    .field-name {
        grid-column: 1 / -1;
    }

    .field-grade {
        grid-column: 1;
    }

    .field-weight {
        grid-column: 2;
    }

    .mode-simple .field-grade {
        grid-column: 1 / span 2;
    }

    .mobile-label {
        display: block;
        font-size: 0.65rem;
        font-weight: 700;
        text-transform: uppercase;
        color: var(--text-dim);
        margin-bottom: 6px;
        letter-spacing: 0.05em;
        text-align: left;
        opacity: 0.8;
    }

    [data-theme="light"] .mobile-label {
        color: #64748b;
    }

    .btn-remove {
        grid-column: 3;
        grid-row: 2;
        width: 40px;
        height: 40px;
        margin: 0;
        justify-self: center;
    }

    [data-theme="light"] .btn-remove {
        color: #0ea5e9;
        background: rgba(14, 165, 233, 0.1);
        border-color: rgba(14, 165, 233, 0.2);
    }

    [data-theme="light"] .btn-remove:hover {
        background: #0ea5e9;
        color: white;
    }

    .btn-remove svg {
        width: 16px;
        height: 16px;
    }

    .card-header {
        flex-direction: column;
        align-items: center;
        text-align: center;
        gap: 1.5rem;
    }

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

    .mode-selector {
        width: 100%;
        justify-content: center;
    }

    .scale-selector {
        width: 100%;
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: 4px;
        padding: 5px;
    }

    .scale-selector .scale-btn:nth-child(n+4) {
        grid-column: span 1.5; /* Esto es un truco, mejor usemos span 3 para las ultimas o cambiemos a flex */
    }

    /* Mejor opción para 5 botones: 3 arriba, 2 abajo */
    /* Deslizable pero con el diseño original */
    .scale-selector {
        width: 100%;
        display: flex;
        flex-wrap: nowrap;
        overflow-x: auto;
        justify-content: flex-start;
        padding: 0.3rem;
        gap: 0.25rem;
        background: rgba(0, 0, 0, 0.2); /* Volvemos al fondo original */
        border-radius: 12px;
        -webkit-overflow-scrolling: touch;
        scrollbar-width: none;
    }

    .scale-selector::-webkit-scrollbar {
        display: none;
    }

    .scale-selector .scale-btn {
        flex: 0 0 auto;
        padding: 0.5rem 1rem;
        border-radius: 8px; /* Volvemos al redondeo original */
        font-size: 0.85rem;
        background: transparent;
        border: none;
        box-shadow: none;
    }

    .scale-selector .scale-btn.active {
        background: var(--primary);
        color: white;
    }

    .mode-selector button {
        flex: 1;
        padding: 0.6rem 0.5rem;
        font-size: 0.9rem;
    }
}

@media (max-width: 380px) {
    .container {
        padding: 0 0.5rem;
        /* Even more compact on tiny screens */
    }

    .logo {
        font-size: 1.1rem;
    }

    .glass-card {
        padding: 1.25rem 0.5rem;
    }

    .grade-rows.mode-weighted .grade-row {
        grid-template-columns: 1fr 1fr 38px;
        gap: 10px 8px;
        padding: 1rem;
    }

    .grade-rows.mode-simple .grade-row {
        grid-template-columns: 1fr 1fr 38px;
        gap: 10px 8px;
        padding: 1rem;
    }

    .btn-remove {
        height: 40px;
        width: 38px;
    }

    input {
        padding: 0.65rem 0.4rem;
        font-size: 0.9rem;
    }
}

/* Predictor Section */
.predictor-section {
    padding: 2rem 0 6rem;
}

.predictor-card {
    max-width: 650px;
    margin: 0 auto;
    border-top: 4px solid var(--secondary);
}


@media (max-width: 600px) {
    .btn-sync {
        width: 100%;
        justify-content: center;
        padding: 0.75rem;
    }
}

.btn-sync {
    background: rgba(6, 182, 212, 0.1);
    border: 1px solid rgba(6, 182, 212, 0.3);
    color: var(--secondary);
    padding: 0.5rem 1rem;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.3s;
    font-size: 0.85rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

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

.sync-icon {
    font-size: 1rem;
}

.input-help {
    font-size: 0.75rem;
    color: var(--text-dim);
    margin-top: 0.25rem;
    opacity: 0.8;
}

.predictor-card .card-header {
    flex-direction: column;
    text-align: center;
    gap: 0.5rem;
}

.subtitle {
    color: var(--text-dim);
    font-size: 1rem;
}

.predictor-inputs {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

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

.input-group label {
    font-size: 0.9rem;
    color: var(--text-dim);
    font-weight: 500;
}

.predictor-result-box {
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-color: rgba(6, 182, 212, 0.2);
}

@media (max-width: 600px) {
    .predictor-inputs {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .input-group input {
        padding: 0.60rem 0.8rem;
        font-size: 0.9rem;
    }

    .predictor-card {
        padding: 1.5rem;
    }
}

/* Footer */
footer {
    background: rgba(15, 23, 42, 0.8);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-top: 1px solid var(--glass-border);
    margin-top: 4rem;
    padding: 2.5rem 0;
    text-align: center;
}

.footer-inner {
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    max-width: 1550px;
    margin: 0 auto;
    padding: 0 2rem;
    gap: 1rem;
    flex-wrap: wrap;
}

.logo-footer {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    font-size: 1.1em;
    font-weight: 700;
    font-family: 'Outfit', sans-serif;
    color: #94a3b8;
}

.logo-footer .logo-icon img {
    height: 30px;
    width: auto;
    display: block;
    object-fit: contain;
}

.logo-footer .logo-text {
    color: var(--text-dim);
}

.logo-footer .logo-text span {
    color: inherit;
}

.logo-footer .logo-text-footer {
    font-size: 1.0em;
    /* ajusta este valor */
    font-weight: 600;
}

.footer-copy {
    color: var(--text-dim);
    font-size: 0.85rem;
    text-align: center;
    flex: 1;
}


.footer-links {
    display: flex;
    align-items: center;
    gap: 1.25rem;
    margin-left: auto;
}

.footer-links a {
    color: var(--text-dim);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color 0.3s;
}


.footer-links a:hover {
    color: var(--text-main);
}


@media (max-width: 600px) {
    .footer-inner {
        flex-direction: column;
        text-align: center;
        gap: 0.75rem;
    }

    .footer-copy {
        flex: none;
    }

    .footer-links {
        margin-left: 0;
        justify-content: center;
        width: 100%;
    }
}

/* FAQ Section */
.faq-section {
    padding: 4rem 0 -1rem;
}



.faq-container {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.faq-item {
    background: var(--card-bg);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    overflow: hidden;
    transition: all 0.3s ease;
}

.faq-item:hover {
    border-color: var(--primary);
    background: rgba(30, 41, 59, 0.9);
}

.faq-question {
    padding: 1.5rem;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: 600;
    font-size: 1.1rem;
    color: var(--text-main);
    user-select: none;
}

.faq-icon {
    font-size: 1.5rem;
    color: var(--secondary);
    transition: transform 0.3s ease;
}

.faq-item.active {
    border-color: var(--primary);
    box-shadow: 0 0 20px rgba(99, 102, 241, 0.15);
}

.faq-item.active .faq-icon {
    transform: rotate(45deg);
    color: var(--accent);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: all 0.3s ease-in-out;
    background: rgba(0, 0, 0, 0.1);

}

.faq-item.active .faq-answer {
    max-height: 2000px;
    /* Incrementado para que quepa la tabla de GPA sin cortarse */
    padding: 0 1.5rem 1.5rem;
}

.faq-answer p {
    color: var(--text-dim);
    font-size: 0.95rem;
    line-height: 1.7;
}

@media (max-width: 600px) {
    .section-title {
        font-size: 1.8rem;
    }

    .faq-question {
        padding: 1rem 1.25rem;
        font-size: 0.95rem;
    }

    .faq-answer p {
        font-size: 0.88rem;
        line-height: 1.6;
    }

    .faq-item.active .faq-answer {
        max-height: 1000px;
        /* Evita que se corte el texto largo */
        padding: 0 1.25rem 1.25rem;
    }
}

/* Modal de Imagen */
.modal {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(15, 23, 42, 0.9);
    backdrop-filter: blur(8px);
    animation: fadeIn 0.3s ease-out;
}

.modal-content {
    background: var(--card-bg);
    margin: 5% auto;
    padding: 2rem;
    border: 1px solid var(--glass-border);
    width: 90%;
    max-width: 500px;
    border-radius: 24px;
    position: relative;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
}

.close-modal {
    color: var(--text-dim);
    position: absolute;
    top: 15px;
    right: 20px;
    font-size: 2rem;
    font-weight: bold;
    cursor: pointer;
    transition: color 0.3s;
}

.close-modal:hover {
    color: var(--accent);
}

.modal-body {
    text-align: center;
}

.modal-body h3 {
    margin-bottom: 1.5rem;
    color: var(--text-main);
}

#preview-image-container img {
    width: 100%;
    height: auto;
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    margin-bottom: 2rem;
}

.modal-actions {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

@media (max-width: 480px) {
    .modal-content {
        margin: 10% auto;
        padding: 1.5rem;
    }

    .modal-actions {
        gap: 0.75rem;
    }
}


/* SEO Links Section */
.seo-links-section {
    margin-top: 3rem;
    margin-bottom: 4rem;
}

.seo-links-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    max-width: 800px;
    margin: 0 auto;
}

.seo-link-card {
    background: rgba(224, 27, 27, 0.02);
    padding: 2rem;
    border-radius: 20px;
    border: 1px solid var(--glass-border);
}

.seo-link-card h3 {
    margin-bottom: 1.5rem;
    color: var(--primary);
    font-size: 1.25rem;
}

.seo-link-card ul {
    list-style: none;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1rem;
}

.seo-link-card ul li a {
    color: var(--text-dim);
    text-decoration: none;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.seo-link-card ul li a:hover {
    color: var(--secondary);
    padding-left: 5px;
}

.seo-link-card ul li a::before {
    content: '→';
    color: var(--secondary);
    font-weight: bold;
}