/* CSS Custom Properties */
:root {
    --primary-orange: #ff9500;
    --primary-blue: #01ACFD;
    --primary-cyan: #05D4DF;
    --primary-purple: #5D58EF;
    --secondary-green: #95B226;
    --secondary-cyan: #3CD8E8;
    --text-dark: #202020;
    --text-gray: #808080;
    --text-light-gray: #666666;
    --background-white: #ffffff;
    --background-light-blue: #DEF5FF;
    --background-light-yellow: #FFF4DC;
    --border-radius-small: 1.2rem;
    --border-radius-medium: 1.6rem;
    --border-radius-large: 1.8rem;
    --transition-fast: 0.2s ease;
    --transition-medium: 0.3s ease;
    --shadow-light: 0 0.1rem 0.1rem rgba(0, 0, 0, 0.1);
    --font-family: "Quicksand", Arial, sans-serif;
}

/* Base Styles */
html {
    font-size: 62.5%;
    /* 1rem = 10px */
    scroll-behavior: smooth;
}

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

body {
    font-family: var(--font-family);
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--background-white);
    overflow-x: hidden;
}

/* Focus Styles for Accessibility */
*:focus {
    outline: 0.2rem solid var(--primary-blue);
    outline-offset: 0.2rem;
}

/* Button Base Styles */
.btn {
    display: inline-block;
    padding: 1.2rem 2.4rem;
    border: none;
    border-radius: var(--border-radius-small);
    font-size: 1.6rem;
    font-weight: 600;
    color: var(--background-white);
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition-medium);
    text-align: center;
}

.btn:hover {
    transform: translateY(-0.2rem);
    box-shadow: 0 0.4rem 0.8rem rgba(0, 0, 0, 0.2);
}

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

.btn-primary {
    background-color: var(--primary-orange);
}

.btn-secondary {
    background-color: var(--text-dark);
}

/* Container */
.container {
    max-width: 116rem;
    margin: 0 auto;
    padding: 0 2rem;
}

/* Header */
.header {
    background-color: var(--background-white);
    box-shadow: var(--shadow-light);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 2rem 0;
    min-height: 6.2rem;
}

.brand {
    display: flex;
    align-items: center;
    gap: 1.1rem;
    text-decoration: none;
}

.logo {
    width: 4.6rem;
    height: 4.6rem;
    transition: var(--transition-fast);
}

.logo:hover {
    transform: scale(1.05);
}

.brand-text {
    font-size: 3.2rem;
    font-weight: 700;
    color: var(--text-dark);
}

.nav-list {
    display: flex;
    gap: 3.2rem;
    list-style: none;
}

.nav-link {
    text-decoration: none;
    font-size: 2rem;
    font-weight: 500;
    transition: var(--transition-fast);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -0.5rem;
    left: 0;
    width: 0;
    height: 0.2rem;
    background-color: currentColor;
    transition: var(--transition-fast);
}

.nav-link:hover::after {
    width: 100%;
}

.nav-link--home {
    color: var(--primary-orange);
    font-weight: 700;
}

.nav-link--about {
    color: var(--primary-blue);
}

.nav-link--services {
    color: var(--primary-cyan);
}

.nav-link--contact {
    color: var(--primary-purple);
}

.mobile-menu {
    display: none;
    width: 2.4rem;
    height: 2.4rem;
    cursor: pointer;
    margin-right: 2rem;
}

/* Hero Section */
.hero {
    padding: 6rem 0;
    background: linear-gradient(135deg, rgba(1, 172, 253, 0.05) 0%, rgba(255, 255, 255, 1) 100%);
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.hero-text h1 {
    font-size: 5.6rem;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 2.4rem;
}

.hero-text .empowering {
    color: var(--primary-orange);
}

.hero-text .vision {
    color: var(--primary-blue);
}

.hero-text p {
    font-size: 2rem;
    font-weight: 400;
    margin-bottom: 2.4rem;
    color: var(--text-gray);
}

.hero-image {
    text-align: center;
}

.hero-image img {
    max-width: 100%;
    height: auto;
    border-radius: var(--border-radius-medium);
    transition: var(--transition-medium);
}

.hero-image img:hover {
    transform: scale(1.02);
}

/* Curriculum Section */
.curriculum {
    padding: 8rem 0;
    linear-gradient(135deg, rgba(222, 245, 255, 0.3) 0%, rgba(255, 255, 255, 1) 100%);
}

.section-title {
    text-align: center;
    font-size: 4.6rem;
    font-weight: 700;
    margin-bottom: 6rem;
    color: var(--text-dark);
}

.curriculum-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2.8rem;
    margin-bottom: 4rem;
}

.card {
    background: linear-gradient(180deg, var(--background-light-blue) 0%, rgba(255, 255, 255, 0) 100%);
    border: 0.05rem solid var(--background-light-blue);
    border-radius: var(--border-radius-large);
    padding: 4rem;
    text-align: center;
    box-shadow: var(--shadow-light);
    transition: var(--transition-medium);
    height: 47.7rem;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.card:hover {
    transform: translateY(-0.5rem);
    box-shadow: 0 1rem 3rem rgba(0, 0, 0, 0.15);
}

.card--elementary {
    background: linear-gradient(180deg, var(--background-light-yellow) 0%, rgba(255, 255, 255, 0) 100%);
    border-color: var(--background-light-yellow);
}

.card--middle {
    background: linear-gradient(180deg, #f0e6ff 0%, rgba(255, 255, 255, 0) 100%);
    border-color: #f0e6ff;
}

.card img {
    width: 13.1rem;
    height: 11.2rem;
    margin-bottom: 2rem;
    transition: var(--transition-fast);
}

.card:hover img {
    transform: scale(1.1);
}

.card h3 {
    font-size: 2.4rem;
    font-weight: 700;
    margin-bottom: 1.6rem;
    color: var(--text-dark);
}

.card p {
    font-size: 1.5rem;
    font-weight: 500;
    color: var(--text-gray);
    line-height: 1.8;
    margin-bottom: 2rem;
    flex-grow: 1;
}

.card-link {
    font-size: 1.5rem;
    font-weight: 700;
    text-decoration: none;
    color: #64C8FF;
    transition: var(--transition-fast);
}

.card-link:hover {
    color: var(--primary-blue);
    text-decoration: underline;
}

.card--elementary .card-link {
    color: #F0AA00;
}

.card--middle .card-link {
    color: #8700FF;
}

/* Stories Section */
.stories {
    padding: 8rem 0;
    background: url(images/story-bg.webp) center/contain no-repeat,
        linear-gradient(180deg, var(--background-white) 0%, rgba(254, 161, 1, 0.1) 100%);
}

.stories-marquee {
    font-size: 2.4rem;
    font-weight: 500;
    text-align: center;
    margin-bottom: 6rem;
    color: var(--text-gray);
    animation: fadeInUp 1s ease;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(2rem);
    }

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

.stories-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(25rem, 1fr));
    gap: 2rem;
    margin-bottom: 4rem;
}

.story-card {
    background-color: var(--background-white);
    border-radius: var(--border-radius-medium);
    overflow: hidden;
    box-shadow: var(--shadow-light);
    transition: var(--transition-medium);
    height: 30.2rem;
}

.story-card:hover {
    transform: translateY(-0.3rem);
    box-shadow: 0 0.8rem 2.4rem rgba(0, 0, 0, 0.15);
}

.story-card--featured {
    grid-column: span 2;
    grid-row: span 2;
    height: auto;
}

.story-card img {
    width: 100%;
    height: 17.7rem;
    object-fit: cover;
    transition: var(--transition-medium);
}

.story-card--featured img {
    height: 33.7rem;
}

.story-card:hover img {
    transform: scale(1.05);
}

.story-content {
    padding: 2rem;
    position: relative;
}

.story-date {
    display: inline-block;
    background-color: var(--secondary-green);
    color: var(--background-white);
    padding: 0.8rem 1.6rem;
    border-radius: 4.8rem;
    font-size: 1.2rem;
    font-weight: 500;
    margin-top: -3rem;
    margin-bottom: 1.5rem;
}

.story-card--featured .story-date {
    background-color: var(--secondary-cyan);
}

.story-card:nth-child(3) .story-date {
    background-color: var(--primary-purple);
}

.story-title {
    font-size: 1.5rem;
    font-weight: 700;
    line-height: 1.4;
    color: var(--text-dark);
    margin-bottom: 1rem;
}

.story-card--featured .story-title {
    font-size: 2.4rem;
    margin-bottom: 1.5rem;
}

.story-excerpt {
    font-size: 1.5rem;
    font-weight: 400;
    color: var(--text-light-gray);
    line-height: 1.8;
    display: none;
}

.story-card--featured .story-excerpt {
    display: block;
}

/* Footer */
.footer {
    background-color: var(--primary-blue);
    padding: 6rem 0 4rem;
    color: var(--background-white);
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 4rem;
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 1.1rem;
    margin-bottom: 3rem;
}

.footer-brand img {
    width: 8.2rem;
    height: 8.2rem;
}

.footer-brand-text {
    font-size: 4.2rem;
    font-weight: 700;
    line-height: 1.2;
}

.footer-description {
    font-size: 2rem;
    font-weight: 400;
    line-height: 1.6;
    opacity: 0.9;
}

.footer-section h3 {
    font-size: 2.4rem;
    font-weight: 700;
    margin-bottom: 3rem;
}

.footer-list {
    list-style: none;
}

.footer-list li {
    margin-bottom: 2rem;
}

.footer-list a {
    color: var(--background-white);
    text-decoration: none;
    font-size: 1.8rem;
    transition: var(--transition-fast);
    opacity: 0.8;
}

.footer-list a:hover {
    opacity: 1;
    text-decoration: underline;
}

.social-links {
    display: flex;
    gap: 1.5rem;
    margin-top: 2rem;
}

.social-links a {
    display: inline-block;
    transition: var(--transition-fast);
}

.social-links a:hover {
    transform: scale(1.1);
}

.social-links img {
    width: 4rem;
    height: 4rem;
}

/* Responsive Design */
/* Tablet Breakpoint - 2 cards per row */
@media (max-width: 1024px) {
    .curriculum-cards {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    html {
        font-size: 56.25%;
        /* 1rem = 9px */
    }

    .container {
        padding: 0 1.6rem;
    }

    /* Header Mobile */
    .nav {
        padding: 1.2rem 0;
    }

    .brand-text,
    .nav-list,
    .btn {
        display: none;
    }

    .mobile-menu {
        display: block;
    }

    .logo {
        width: 4.6rem;
        height: 4.6rem;
    }

    /* Hero Mobile */
    .hero {
        padding: 4rem 0;
    }

    .hero-content {
        grid-template-columns: 1fr;
        gap: 2rem;
        text-align: center;
    }

    .hero-content> :first-child {
        order: 2;
    }

    .hero-text h1 {
        font-size: 3.2rem;
        margin-bottom: 1.8rem;
    }

    .hero-text p {
        font-size: 1.4rem;
        margin-bottom: 1.8rem;
    }

    .btn {
        padding: 1rem 2rem;
        font-size: 1.4rem;
    }

    /* Curriculum Mobile - Maintain Card Layout */
    .curriculum {
        padding: 4rem 0;
    }

    .section-title {
        font-size: 2.6rem;
        margin-bottom: 4rem;
    }

    /* Stories Mobile */
    .stories {
        padding: 4rem 0;
        background: var(--background-white);
    }

    .stories-marquee {
        font-size: 1.8rem;
        margin-bottom: 4rem;
    }

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

    .story-card {
        height: 18rem;
    }

    .story-card--featured {
        grid-column: span 2;
        grid-row: span 1;
        height: 18rem;
    }

    .story-card img {
        height: 10.5rem;
    }

    .story-card--featured img {
        height: 10.5rem;
    }

    .story-content {
        padding: 1rem;
    }

    .story-date {
        font-size: 0.9rem;
        padding: 0.5rem 1rem;
        margin-top: -2rem;
        margin-bottom: 1rem;
    }

    .story-title {
        font-size: 0.9rem;
        line-height: 1.3;
    }

    .story-card--featured .story-title {
        font-size: 0.9rem;
    }

    /* Footer Mobile */
    .footer {
        padding: 4rem 0;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 3rem;
    }

    .footer-brand-text {
        font-size: 3rem;
    }

    .footer-description {
        font-size: 1.6rem;
    }

    .footer-section h3 {
        font-size: 2rem;
        margin-bottom: 2rem;
    }

    .footer-list a {
        font-size: 1.6rem;
    }

    .social-links img {
        width: 3rem;
        height: 3rem;
    }
}

@media (max-width: 480px) {
    html {
        font-size: 50%;
        /* 1rem = 8px */
    }

    .hero-text h1 {
        font-size: 2.8rem;
    }

    .section-title {
        font-size: 2.2rem;
    }

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

    .story-card--featured {
        grid-column: span 1;
    }

    .curriculum-cards {
        grid-template-columns: 1fr;
        padding: 1rem;
    }
}

/* Utility Classes */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}