/* ======================================
   GLOBAL STYLES — MODERN 2025 DESIGN
   ====================================== */

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

body {
    font-family: "Inter", sans-serif;
    background: #ffffff;
    color: #1a1a1a;
    line-height: 1.7;
    overflow-x: hidden;
}

/* Color System */
:root {
    --primary: #3A86FF;
    --primary-dark: #2F6ED1;
    --text-dark: #1A1A1A;
    --text-light: #6F6F6F;
    --card-bg: #ffffff;
    --border: #E6E6E6;
    --background-soft: #F7F9FC;
}

/* ======================================
   HEADER — MOBILE FIRST
   ====================================== */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 14px 20px;
    background: #fff;
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 999;
}

.logo img {
    height: 36px;
}

/* Hamburger menu */
.hamburger {
    font-size: 28px;
    cursor: pointer;
    display: block;
    color: var(--text-dark);
}

/* Nav hidden by default */
.nav {
    display: none;
    flex-direction: column;
    width: 100%;
    background: #fff;
    border-top: 1px solid var(--border);
}

.nav.show {
    display: flex;
}

.nav a {
    padding: 15px;
    border-bottom: 1px solid var(--border);
    text-decoration: none;
    color: var(--text-dark);
    font-size: 16px;
}

/* ======================================
   BUTTONS
   ====================================== */
.btn-primary {
    display: inline-block;
    background: var(--primary);
    padding: 12px 20px;
    color: #fff;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    transition: 0.3s ease;
}

.btn-primary:hover {
    background: var(--primary-dark);
}

.btn-outline {
    display: inline-block;
    border: 2px solid var(--primary);
    padding: 12px 20px;
    border-radius: 8px;
    color: var(--primary);
    text-decoration: none;
    font-weight: 600;
    transition: 0.3s ease;
}

.btn-outline:hover {
    background: var(--primary);
    color: #fff;
}

/* ======================================
   HERO SECTIONS — MOBILE FIRST
   ====================================== */
.hero,
.service-hero,
.course-hero,
.gate-hero {
    text-align: center;
    padding: 70px 20px;
    background: var(--background-soft);
}

.hero h1,
.service-hero h1,
.course-hero h1,
.gate-hero h1 {
    font-size: 28px;
    margin-bottom: 15px;
    line-height: 1.3;
}

.hero p,
.service-hero p,
.course-hero p,
.gate-hero p {
    font-size: 16px;
    color: var(--text-light);
    max-width: 500px;
    margin: 0 auto;
}

.hero-buttons {
    margin-top: 20px;
}

/* ======================================
   CARDS SYSTEM — UNIFIED DESIGN
   ====================================== */
.section {
    padding: 50px 20px;
}

.section-title {
    font-size: 24px;
    margin-bottom: 30px;
    text-align: center;
}

.card,
.course-card,
.service-card,
.mock-card,
.dashboard-card,
.dashboard-item {
    background: var(--card-bg);
    padding: 22px;
    border-radius: 14px;
    border: 1px solid var(--border);
    transition: 0.3s ease;
}

.card:hover,
.course-card:hover,
.service-card:hover,
.mock-card:hover,
.dashboard-item:hover {
    transform: translateY(-3px);
    box-shadow: 0px 10px 25px rgba(0,0,0,0.07);
}

/* GRID LAYOUT — Mobile First */
.card-grid,
.course-grid,
.service-grid,
.mock-exam-grid,
.dashboard-grid {
    display: grid;
    gap: 20px;
}

/* ======================================
   CTA
   ====================================== */
.cta {
    text-align: center;
    padding: 70px 20px;
    background: var(--primary);
    color: #fff;
}

.cta h2 {
    font-size: 26px;
    margin-bottom: 15px;
}

/* ======================================
   FOOTER
   ====================================== */
.footer {
    text-align: center;
    padding: 18px;
    background: var(--background-soft);
    color: var(--text-light);
    font-size: 14px;
    margin-top: 40px;
}

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

/* Tablets */
@media (min-width: 768px) {

    .nav {
        display: flex !important;
        flex-direction: row;
        border: none;
        width: auto;
    }

    .hamburger {
        display: none;
    }

    .nav a {
        border: none;
        padding: 0 15px;
    }

    .section {
        padding: 70px;
    }

    .hero,
    .service-hero,
    .course-hero,
    .gate-hero {
        padding: 120px 50px;
    }

    .hero h1 {
        font-size: 42px;
    }

    .card-grid,
    .course-grid,
    .service-grid,
    .mock-exam-grid,
    .dashboard-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* Desktop */
@media (min-width: 1200px) {
    .card-grid,
    .course-grid,
    .service-grid,
    .mock-exam-grid,
    .dashboard-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}