/*
  Project: cntt.daihocnguyentrai.edu.vn
  CSS architecture:
  1. Design tokens
  2. Reset and base
  3. Layout utilities
  4. Components
  5. Page sections
  6. Responsive rules
*/

/* 1. Design tokens */
:root {
    --color-primary-900: #075e36;
    --color-primary-800: #08683c;
    --color-primary-700: #0b7a43;
    --color-primary-600: #0f9d58;
    --color-primary-100: #eaf7f0;
    --color-primary-50: #f4fbf7;
    --color-accent-500: #f5b700;

    --color-text: #1f2937;
    --color-heading: #14233c;
    --color-muted: #667085;
    --color-border: #e5e7eb;
    --color-surface: #ffffff;
    --color-surface-soft: #f8fafc;

    --font-base: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Segoe UI", Roboto, Arial, sans-serif;

    --container-width: 1180px;
    --container-padding: 16px;

    --radius-sm: 10px;
    --radius-md: 16px;
    --radius-lg: 22px;
    --radius-xl: 30px;
    --radius-pill: 999px;

    --shadow-sm: 0 8px 24px rgba(16, 24, 40, 0.06);
    --shadow-md: 0 18px 45px rgba(15, 93, 54, 0.12);
    --shadow-lg: 0 24px 60px rgba(7, 94, 54, 0.18);

    --transition-base: 180ms ease;
    --header-height: 86px;
}

/* 2. Reset and base */
*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    color: var(--color-text);
    background: var(--color-surface);
    font-family: var(--font-base);
    font-size: 16px;
    line-height: 1.6;
    font-weight: 400;
    letter-spacing: -0.01em;
    text-rendering: optimizeLegibility;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

img,
svg {
    display: block;
    max-width: 100%;
}

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

button,
input,
textarea,
select {
    font: inherit;
}

button {
    cursor: pointer;
}

h1,
h2,
h3,
p {
    margin-top: 0;
}

:focus-visible {
    outline: 3px solid rgba(245, 183, 0, 0.72);
    outline-offset: 3px;
}

/* 3. Layout utilities */
.container {
    width: min(var(--container-width), calc(100% - var(--container-padding) * 2));
    margin-inline: auto;
}

.section {
    padding-block: 72px;
}

.section--soft {
    background: var(--color-primary-50);
}

.section__head {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    gap: 24px;
    margin-bottom: 30px;
}

.section__title {
    margin-bottom: 8px;
    color: var(--color-primary-900);
    font-size: clamp(28px, 3vw, 40px);
    line-height: 1.2;
    letter-spacing: -0.03em;
}

.section__desc {
    max-width: 700px;
    margin-bottom: 0;
    color: var(--color-muted);
}

.grid {
    display: grid;
    gap: 24px;
}

.grid--2 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

.grid--3 {
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

.grid--4 {
    grid-template-columns: repeat(4, minmax(0, 1fr));
}

.cluster {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 14px;
}

/* 4. Components */
.topbar {
    color: var(--color-surface);
    background: var(--color-primary-900);
    font-size: 14px;
}

.topbar__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding-block: 8px;
}

.topbar__links {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 20;
    border-bottom: 1px solid var(--color-border);
    background: rgba(255, 255, 255, 0.96);
    backdrop-filter: blur(10px);
}

.site-header__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    min-height: var(--header-height);
}

.brand {
    display: flex;
    align-items: center;
    gap: 12px;
    min-width: 280px;
}

.brand__logo {
    display: grid;
    width: 56px;
    height: 56px;
    place-items: center;
    border-radius: var(--radius-md);
    color: var(--color-surface);
    background: linear-gradient(135deg, var(--color-primary-600), var(--color-primary-900));
    box-shadow: var(--shadow-md);
    font-weight: 800;
}

.brand__name {
    display: block;
    color: var(--color-primary-900);
    font-size: 16px;
    font-weight: 800;
    line-height: 1.25;
    text-transform: uppercase;
}

.brand__sub {
    display: block;
    margin-top: 2px;
    color: var(--color-muted);
    font-size: 13px;
}

.main-nav {
    display: flex;
    align-items: center;
    gap: 18px;
    color: #243145;
    font-size: 14px;
    font-weight: 700;
}

.main-nav__link {
    padding-block: 8px;
    border-bottom: 2px solid transparent;
    transition: color var(--transition-base), border-color var(--transition-base);
}

.main-nav__link:hover {
    color: var(--color-primary-700);
    border-color: var(--color-primary-600);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding-inline: 22px;
    border: 1px solid transparent;
    border-radius: 12px;
    font-weight: 800;
    line-height: 1;
    transition: transform var(--transition-base), box-shadow var(--transition-base), background var(--transition-base);
}

.btn:hover {
    transform: translateY(-1px);
}

.btn--primary {
    color: var(--color-surface);
    background: var(--color-primary-600);
    box-shadow: 0 12px 26px rgba(15, 157, 88, 0.24);
}

.btn--primary:hover {
    background: var(--color-primary-700);
}

.btn--secondary {
    color: var(--color-primary-900);
    background: var(--color-surface);
    border-color: rgba(15, 157, 88, 0.25);
}

.btn--pill {
    min-height: 42px;
    padding-inline: 18px;
    border-radius: var(--radius-pill);
}

.eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 14px;
    border-radius: var(--radius-pill);
    color: var(--color-primary-900);
    background: var(--color-primary-100);
    font-size: 14px;
    font-weight: 700;
}

.eyebrow::before {
    content: "";
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--color-accent-500);
}

.badge {
    display: inline-flex;
    margin-bottom: 12px;
    padding: 5px 10px;
    border-radius: var(--radius-pill);
    color: var(--color-primary-900);
    background: var(--color-primary-100);
    font-size: 12px;
    font-weight: 800;
}

.card {
    overflow: hidden;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    background: var(--color-surface);
    box-shadow: var(--shadow-sm);
}

.card__media {
    min-height: 180px;
    background-color: var(--color-primary-100);
    background-position: center;
    background-size: cover;
}

.card__body {
    padding: 22px;
}

.card__title {
    margin-bottom: 10px;
    color: var(--color-heading);
    font-size: 20px;
    line-height: 1.35;
}

.card__text {
    margin-bottom: 0;
    color: var(--color-muted);
}

.view-more {
    color: var(--color-primary-700);
    font-weight: 800;
    white-space: nowrap;
}

.form-section {
    margin: 0 0 28px;
    padding: 0;
    border: 0;
}

.form-section__title {
    display: block;
    width: 100%;
    margin-bottom: 18px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--color-border);
    color: var(--color-primary-900);
    font-size: 18px;
    font-weight: 700;
}

.form-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
}

.form-field {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.form-field--full {
    grid-column: 1 / -1;
}

.form-label {
    color: var(--color-heading);
    font-size: 14px;
    font-weight: 600;
}

.form-required {
    color: #d92d20;
}

.form-control {
    width: 100%;
    min-height: 48px;
    padding: 12px 14px;
    border: 1px solid var(--color-border);
    border-radius: 12px;
    color: var(--color-text);
    background: var(--color-surface);
    transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

.form-control:focus {
    border-color: var(--color-primary-600);
    box-shadow: 0 0 0 4px rgba(15, 157, 88, 0.12);
    outline: none;
}

.form-control::placeholder {
    color: #98a2b3;
}

.form-control--textarea {
    min-height: 120px;
    resize: vertical;
}

.form-field--checkbox {
    margin-top: 8px;
}

.form-checkbox {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    color: var(--color-muted);
    font-size: 14px;
    line-height: 1.5;
}

.form-checkbox input {
    width: 18px;
    height: 18px;
    margin-top: 2px;
    accent-color: var(--color-primary-600);
}

.form-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 8px;
}

.form-status {
    margin-bottom: 18px;
    padding: 14px 16px;
    border-radius: 12px;
    font-size: 14px;
    font-weight: 600;
    line-height: 1.5;
}

.form-status--info {
    color: #175cd3;
    background: #eff8ff;
    border: 1px solid #b2ddff;
}

.form-status--success {
    color: #067647;
    background: #ecfdf3;
    border: 1px solid #abefc6;
}

.form-status--error {
    color: #b42318;
    background: #fef3f2;
    border: 1px solid #fecdca;
}

.btn:disabled {
    cursor: not-allowed;
    opacity: 0.7;
    transform: none;
}

.admission {
    display: grid;
    grid-template-columns: 0.85fr 1.15fr;
    gap: 28px;
    align-items: start;
}

.admission__info {
    padding: 28px;
    border: 1px solid rgba(15, 157, 88, 0.18);
    border-radius: var(--radius-lg);
    background: linear-gradient(180deg, var(--color-primary-50), var(--color-surface));
}

.admission__list {
    display: grid;
    gap: 12px;
    margin: 20px 0 0;
    padding-left: 18px;
    color: var(--color-muted);
}

.admission__list a {
    color: var(--color-primary-700);
    font-weight: 700;
}

.admission__list a:hover {
    color: var(--color-primary-900);
}

.admission-form {
    padding: 28px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    background: var(--color-surface);
    box-shadow: var(--shadow-sm);
}

/* 5. Page sections */
.hero {
    overflow: hidden;
    background:
        radial-gradient(circle at 85% 10%, rgba(245, 183, 0, 0.22), transparent 30%),
        linear-gradient(135deg, var(--color-primary-50) 0%, #ffffff 48%, var(--color-primary-100) 100%);
}

.hero__inner {
    display: grid;
    grid-template-columns: 1.05fr 0.95fr;
    align-items: center;
    gap: 48px;
    padding-block: 64px;
}

.hero__title {
    margin: 18px 0 16px;
    color: var(--color-primary-900);
    font-size: clamp(36px, 5vw, 62px);
    line-height: 1.08;
    letter-spacing: -0.04em;
}

.hero__lead {
    max-width: 620px;
    margin-bottom: 0;
    color: #42526b;
    font-size: 18px;
}

.hero__actions {
    margin-top: 28px;
}

.hero__visual {
    position: relative;
    min-height: 420px;
    padding: 26px;
    border-radius: var(--radius-xl);
    background: linear-gradient(145deg, var(--color-primary-700), var(--color-primary-900));
    box-shadow: var(--shadow-lg);
}

.hero__image {
    height: 250px;
    border-radius: 24px;
    background:
        linear-gradient(rgba(7, 94, 54, 0.15), rgba(7, 94, 54, 0.45)),
        url("https://images.unsplash.com/photo-1522202176988-66273c2fd55f?auto=format&fit=crop&w=1000&q=80") center/cover;
}

.hero__feature {
    position: absolute;
    right: 26px;
    bottom: 26px;
    width: min(360px, calc(100% - 52px));
    padding: 22px;
    border-radius: var(--radius-lg);
    background: var(--color-surface);
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.18);
}

.stat-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 14px;
    margin-top: 24px;
}

.stat-card {
    padding: 18px;
    border-radius: 18px;
    color: var(--color-surface);
    background: rgba(255, 255, 255, 0.13);
}

.stat-card__number {
    display: block;
    font-size: 28px;
    line-height: 1.1;
}

.stat-card__label {
    font-size: 13px;
    opacity: 0.9;
}

.news-media--one {
    background-image: url("https://images.unsplash.com/photo-1531482615713-2afd69097998?auto=format&fit=crop&w=800&q=80");
}

.news-media--two {
    background-image: url("https://images.unsplash.com/photo-1516321318423-f06f85e504b3?auto=format&fit=crop&w=800&q=80");
}

.news-media--three {
    background-image: url("https://images.unsplash.com/photo-1517048676732-d65bc937f952?auto=format&fit=crop&w=800&q=80");
}

.notice-list {
    display: grid;
    gap: 14px;
}

.notice-card {
    display: grid;
    grid-template-columns: 78px 1fr;
    gap: 18px;
    align-items: center;
    padding: 18px;
    border: 1px solid var(--color-border);
    border-radius: 20px;
    background: var(--color-surface);
}

.notice-card__date {
    display: grid;
    height: 78px;
    place-items: center;
    border-radius: 18px;
    color: var(--color-surface);
    background: var(--color-primary-600);
    text-align: center;
}

.notice-card__day {
    display: block;
    font-size: 26px;
    font-weight: 800;
    line-height: 1;
}

.program-card {
    padding: 26px;
    border: 1px solid rgba(15, 157, 88, 0.18);
    border-radius: 24px;
    background: var(--color-surface);
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

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

.program-card__icon {
    display: grid;
    width: 54px;
    height: 54px;
    margin-bottom: 18px;
    place-items: center;
    border-radius: var(--radius-md);
    color: var(--color-primary-900);
    background: var(--color-primary-100);
    font-weight: 800;
}

.why {
    display: grid;
    grid-template-columns: 0.9fr 1.1fr;
    gap: 42px;
    align-items: center;
}

.why__panel {
    padding: 34px;
    border-radius: 28px;
    color: var(--color-surface);
    background: linear-gradient(145deg, var(--color-primary-600), var(--color-primary-900));
    box-shadow: var(--shadow-md);
}

.why__title {
    margin-bottom: 14px;
    font-size: 34px;
    line-height: 1.2;
}

.why__text {
    margin-bottom: 0;
    opacity: 0.92;
}

.why__items {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
}

.why-item {
    padding: 22px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    background: var(--color-surface);
}

.why-item__number {
    display: block;
    margin-bottom: 6px;
    color: var(--color-primary-900);
    font-size: 30px;
    font-weight: 800;
}

.partner-row {
    display: grid;
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 16px;
}

.partner-card {
    display: grid;
    min-height: 86px;
    place-items: center;
    border: 1px solid var(--color-border);
    border-radius: 18px;
    color: var(--color-primary-900);
    background: var(--color-surface);
    font-weight: 800;
}

.site-footer {
    color: rgba(255, 255, 255, 0.88);
    background: var(--color-primary-900);
}

.site-footer__grid {
    display: grid;
    grid-template-columns: 1.3fr 0.8fr 0.8fr 1fr;
    gap: 28px;
    padding-block: 54px;
}

.site-footer__title {
    margin-bottom: 14px;
    color: var(--color-surface);
}

.site-footer__text,
.site-footer__link {
    color: rgba(255, 255, 255, 0.78);
}

.site-footer__list {
    display: grid;
    gap: 10px;
    margin: 0;
    padding: 0;
    list-style: none;
}

.site-footer__copyright {
    padding-block: 16px;
    border-top: 1px solid rgba(255, 255, 255, 0.14);
    text-align: center;
    font-size: 14px;
}

/* 6. Responsive rules */
@media (max-width: 1100px) {
    .main-nav {
        display: none;
    }
}

@media (max-width: 980px) {
    .hero__inner,
    .why,
    .admission {
        grid-template-columns: 1fr;
    }

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

    .grid--3,
    .grid--4,
    .partner-row,
    .site-footer__grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 640px) {
    :root {
        --container-padding: 16px;
        --header-height: 74px;
    }

    .topbar__inner,
    .section__head {
        align-items: flex-start;
        flex-direction: column;
    }

    .site-header__inner {
        gap: 14px;
    }

    .brand {
        min-width: 0;
    }

    .brand__logo {
        width: 48px;
        height: 48px;
    }

    .brand__name {
        font-size: 14px;
    }

    .brand__sub,
    .site-header .btn {
        display: none;
    }

    .hero__inner {
        padding-block: 42px;
    }

    .hero__visual {
        min-height: 360px;
    }

    .stat-grid,
    .grid--2,
    .grid--3,
    .grid--4,
    .why__items,
    .partner-row,
    .site-footer__grid {
        grid-template-columns: 1fr;
    }

    .notice-card {
        grid-template-columns: 64px 1fr;
    }

    .notice-card__date {
        height: 64px;
    }

    .form-actions .btn {
        width: 100%;
    }

    .admission-form,
    .admission__info {
        padding: 20px;
    }

    .section {
        padding-block: 48px;
    }
}