/* ==========================================================================
   MindAccel Tutoring - Custom Stylesheet
   ========================================================================== */

/* --- CSS Variables / Color Palette --- */
:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --secondary-color: #0f172a;
    --accent-color: #f59e0b;
    --bg-light: #f8fafc;
    --bg-white: #ffffff;
    --card-bg: #ffffff;
    --text-main: #1e293b;
    --text-muted: #64748b;
    --border-color: #e2e8f0;
    --radius: 12px;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.1);
    --shadow-md: 0 4px 14px rgba(0,0,0,0.08);
    --shadow-lg: 0 10px 25px rgba(37,99,235,0.12);
    --transition: all 0.25s ease-in-out;
}

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

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    color: var(--text-main);
    background-color: var(--bg-light);
    line-height: 1.6;
}

.container {
    width: 90%;
    max-width: 1140px;
    margin: 0 auto;
    padding: 0 1rem;
}

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

/* --- Buttons --- */
.btn-primary {
    background-color: var(--primary-color);
    color: #ffffff;
    padding: 0.8rem 1.6rem;
    border-radius: var(--radius);
    font-weight: 600;
    display: inline-block;
    transition: var(--transition);
    border: none;
    cursor: pointer;
}

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

.btn-secondary {
    background-color: var(--secondary-color);
    color: #ffffff;
    padding: 0.6rem 1.3rem;
    border-radius: var(--radius);
    font-weight: 600;
    display: inline-block;
    transition: var(--transition);
}

.btn-secondary:hover {
    background-color: #334155;
}

.btn-outline {
    background-color: transparent;
    color: var(--secondary-color);
    border: 2px solid var(--border-color);
    padding: 0.8rem 1.6rem;
    border-radius: var(--radius);
    font-weight: 600;
    display: inline-block;
    transition: var(--transition);
}

.btn-outline:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    background-color: rgba(37, 99, 235, 0.04);
}

/* --- Navigation Header --- */
.navbar {
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(8px);
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
}

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

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--secondary-color);
    letter-spacing: -0.5px;
}

.logo-highlight {
    color: var(--primary-color);
}

.logo-icon {
    font-size: 1.3rem;
    margin-right: 0.2rem;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.nav-links a:not(.btn-secondary) {
    font-weight: 500;
    color: var(--text-muted);
    transition: var(--transition);
}

.nav-links a:not(.btn-secondary):hover {
    color: var(--primary-color);
}

/* --- Hero Section --- */
.hero {
    padding: 5rem 0 4rem;
    background: linear-gradient(180deg, #ffffff 0%, var(--bg-light) 100%);
}

.hero-container {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 3rem;
    align-items: center;
}

.badge {
    background-color: rgba(37, 99, 235, 0.1);
    color: var(--primary-color);
    padding: 0.4rem 0.9rem;
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    display: inline-block;
    margin-bottom: 1.2rem;
}

.hero-text h1 {
    font-size: 2.8rem;
    font-weight: 800;
    line-height: 1.2;
    color: var(--secondary-color);
    margin-bottom: 1.2rem;
    letter-spacing: -0.8px;
}

.hero-text p {
    font-size: 1.15rem;
    color: var(--text-muted);
    margin-bottom: 2rem;
}

.hero-cta {
    display: flex;
    gap: 1rem;
}

.hero-card-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.stat-card {
    background-color: var(--bg-white);
    padding: 1.8rem 1.2rem;
    border-radius: var(--radius);
    border: 1px solid var(--border-color);
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

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

.stat-card.accent {
    background-color: var(--primary-color);
    color: #ffffff;
    border-color: var(--primary-color);
}

.stat-card.accent .stat-label {
    color: rgba(255, 255, 255, 0.85);
}

.stat-number {
    font-size: 1.8rem;
    font-weight: 800;
    margin-bottom: 0.3rem;
}

.stat-label {
    font-size: 0.9rem;
    color: var(--text-muted);
    font-weight: 500;
}

/* --- Section Commons --- */
.section-header {
    text-align: center;
    max-width: 650px;
    margin: 0 auto 3.5rem;
}

.section-header h2 {
    font-size: 2.2rem;
    font-weight: 800;
    color: var(--secondary-color);
    margin-bottom: 0.8rem;
    letter-spacing: -0.5px;
}

.section-header .subtitle {
    font-size: 1.1rem;
    color: var(--text-muted);
}

/* --- About Section --- */
.about-section {
    padding: 5rem 0;
}

.about-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.about-box {
    background-color: var(--bg-white);
    padding: 2.5rem 2rem;
    border-radius: var(--radius);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.about-box:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: rgba(37, 99, 235, 0.3);
}

.box-icon {
    font-size: 2.2rem;
    margin-bottom: 1.2rem;
}

.about-box h3 {
    font-size: 1.3rem;
    color: var(--secondary-color);
    margin-bottom: 0.8rem;
}

.about-box p {
    color: var(--text-muted);
    font-size: 0.95rem;
}

/* --- Subjects Section --- */
.subjects-section {
    padding: 5rem 0;
    background-color: #ffffff;
}

.subjects-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.8rem;
}

.subject-card {
    background-color: var(--bg-light);
    padding: 2rem;
    border-radius: var(--radius);
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.subject-card:hover {
    background-color: #ffffff;
    border-color: var(--primary-color);
    box-shadow: var(--shadow-md);
}

.subject-tag {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    color: var(--primary-color);
    background-color: rgba(37, 99, 235, 0.1);
    padding: 0.2rem 0.6rem;
    border-radius: 4px;
    margin-bottom: 0.8rem;
}

.subject-card h3 {
    font-size: 1.25rem;
    color: var(--secondary-color);
    margin-bottom: 0.5rem;
}

.subject-card p {
    color: var(--text-muted);
    font-size: 0.95rem;
}

/* --- How It Works Section --- */
.how-section {
    padding: 5rem 0;
}

.steps-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.step-card {
    background-color: var(--bg-white);
    padding: 2.5rem 2rem;
    border-radius: var(--radius);
    border: 1px solid var(--border-color);
    position: relative;
}

.step-num {
    font-size: 2.5rem;
    font-weight: 800;
    color: rgba(37, 99, 235, 0.15);
    margin-bottom: 0.5rem;
}

.step-card h3 {
    font-size: 1.3rem;
    color: var(--secondary-color);
    margin-bottom: 0.6rem;
}

.step-card p {
    color: var(--text-muted);
    font-size: 0.95rem;
}

.step-card a {
    color: var(--primary-color);
    font-weight: 600;
    text-decoration: underline;
}

/* --- Contact Section --- */
.contact-section {
    padding: 4rem 0 6rem;
}

.contact-box {
    background: linear-gradient(135deg, var(--secondary-color) 0%, #1e293b 100%);
    color: #ffffff;
    padding: 4rem 2rem;
    border-radius: 20px;
    text-align: center;
    box-shadow: var(--shadow-lg);
}

.contact-box h2 {
    font-size: 2.4rem;
    font-weight: 800;
    margin-bottom: 1rem;
}

.contact-box p {
    font-size: 1.1rem;
    color: #94a3b8;
    max-width: 600px;
    margin: 0 auto 2rem;
}

.email-wrapper {
    display: inline-flex;
    align-items: center;
    gap: 0.8rem;
    background-color: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.15);
    padding: 1rem 2rem;
    border-radius: 50px;
    margin-bottom: 1.5rem;
    transition: var(--transition);
}

.email-wrapper:hover {
    background-color: rgba(255, 255, 255, 0.15);
    border-color: var(--primary-color);
}

.email-icon {
    font-size: 1.4rem;
}

.email-link {
    font-size: 1.4rem;
    font-weight: 700;
    color: #ffffff;
    letter-spacing: 0.5px;
}

.contact-subtext {
    font-size: 0.9rem !important;
    color: #64748b !important;
    margin-bottom: 0 !important;
}

/* --- Footer --- */
footer {
    background-color: #ffffff;
    border-top: 1px solid var(--border-color);
    padding: 3rem 0;
    color: var(--text-muted);
    font-size: 0.9rem;
}

.footer-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1.5rem;
}

.footer-logo {
    display: inline-block;
    margin-bottom: 0.5rem;
}

.footer-left p {
    max-width: 400px;
}

.footer-right {
    text-align: right;
}

.footer-right a {
    color: var(--primary-color);
    font-weight: 600;
}

/* --- Responsive Media Queries --- */
@media (max-width: 992px) {
    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-cta {
        justify-content: center;
    }

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

@media (max-width: 640px) {
    .nav-links {
        display: none; /* Can be expanded with a hamburger menu */
    }

    .hero-text h1 {
        font-size: 2rem;
    }

    .hero-card-grid {
        grid-template-columns: 1fr;
    }

    .about-grid, .subjects-grid, .steps-grid {
        grid-template-columns: 1fr;
    }

    .email-link {
        font-size: 1.1rem;
    }

    .footer-container {
        flex-direction: column;
        text-align: center;
    }

    .footer-right {
        text-align: center;
    }
}