/* ==========================================================================
   PLASTEN Education — design tokens & base styles
   ========================================================================== */

:root {
    --color-primary: #14B8A6;
    --color-primary-dark: #0E8F82;
    --color-tint: #E9F7F5;
    --color-ink: #0F2A2E;
    --color-accent: #E85D2C;
    --color-white: #FFFFFF;
    --color-border: #D5EDEA;

    --font-display: 'Archivo', sans-serif;
    --font-body: 'Inter', sans-serif;
    --font-mono: 'IBM Plex Mono', monospace;

    --header-height: 64px;
    --nav-height: 44px;
    --max-width: 1180px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
    margin: 0;
    font-family: var(--font-body);
    color: var(--color-ink);
    background: var(--color-white);
    line-height: 1.55;
    padding-top: calc(var(--header-height) + var(--nav-height));
}

h1, h2, h3, h4 {
    font-family: var(--font-display);
    font-weight: 700;
    line-height: 1.15;
    margin: 0 0 0.5em;
}

a { color: var(--color-primary-dark); text-decoration: none; }
a:hover { text-decoration: underline; }
a:focus-visible, button:focus-visible { outline: 2px solid var(--color-accent); outline-offset: 2px; }

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

.container { max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }

/* ---- Header ---- */
.site-header {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 100;
    background: var(--color-tint);
    border-bottom: 1px solid var(--color-border);
}

.header-bar {
    height: var(--header-height);
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}

.header-logo img { height: 36px; width: auto; }

.header-contact-icons {
    display: flex;
    align-items: center;
    gap: 14px;
}

.contact-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--color-white);
    color: var(--color-primary-dark);
    border: 1px solid var(--color-border);
    cursor: pointer;
    transition: transform 0.15s ease, background 0.15s ease;
}
.contact-icon:hover { background: var(--color-primary); color: var(--color-white); transform: translateY(-1px); }

.header-phone {
    font-family: var(--font-mono);
    font-weight: 500;
    font-size: 15px;
    color: var(--color-ink);
    white-space: nowrap;
}
.header-phone:hover { color: var(--color-primary-dark); }

/* ---- Horizontal nav ---- */
.site-nav {
    height: var(--nav-height);
    background: var(--color-white);
    border-bottom: 1px solid var(--color-border);
}
.site-nav ul {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
    height: 100%;
    list-style: none;
    display: flex;
    align-items: center;
    gap: 28px;
    overflow-x: auto;
}
.site-nav a {
    font-size: 14px;
    font-weight: 600;
    color: var(--color-ink);
    letter-spacing: 0.01em;
    white-space: nowrap;
}
.site-nav a:hover, .site-nav a.active {
    color: var(--color-primary-dark);
    text-decoration: none;
    border-bottom: 2px solid var(--color-accent);
}

/* ---- WeChat QR modal ---- */
.qr-modal {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(15, 42, 46, 0.55);
    z-index: 200;
    align-items: center;
    justify-content: center;
}
.qr-modal.open { display: flex; }
.qr-modal-inner {
    background: var(--color-white);
    border-radius: 12px;
    padding: 24px;
    max-width: 320px;
    text-align: center;
    position: relative;
}
.qr-modal-inner img { border-radius: 8px; margin-bottom: 8px; }
.qr-modal-close {
    position: absolute;
    top: 8px; right: 12px;
    background: none;
    border: none;
    font-size: 24px;
    line-height: 1;
    cursor: pointer;
    color: var(--color-ink);
}

/* ---- Footer ---- */
.site-footer {
    background: var(--color-ink);
    color: #C8DEDB;
    margin-top: 80px;
}
.footer-grid {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 56px 24px 32px;
    display: grid;
    grid-template-columns: 1.4fr 1fr 1fr 1fr 1fr;
    gap: 32px;
}
.footer-logo { height: 30px; filter: brightness(0) invert(1); margin-bottom: 12px; }
.footer-brand p { font-size: 13px; color: #9BC4BF; margin: 0; }
.footer-col h4 {
    color: var(--color-white);
    font-size: 13px;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: 14px;
}
.footer-col ul { list-style: none; margin: 0; padding: 0; }
.footer-col li { margin-bottom: 8px; font-size: 14px; }
.footer-col a { color: #C8DEDB; }
.footer-col a:hover { color: var(--color-primary); }

.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.1);
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 18px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 12px;
    color: #7FA8A3;
    flex-wrap: wrap;
    gap: 8px;
}

/* ---- Hero ---- */
.hero {
    position: relative;
    min-height: 560px;
    display: flex;
    align-items: flex-end;
    overflow: hidden;
}
.hero-media {
    position: absolute;
    inset: 0;
    z-index: 0;
}
.hero-media img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}
.hero-media::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, rgba(15,42,46,0.15) 0%, rgba(15,42,46,0.92) 100%);
}
.hero-content {
    position: relative;
    z-index: 1;
    color: var(--color-white);
    padding-bottom: 56px;
    max-width: 720px;
}
.hero-eyebrow {
    font-family: var(--font-mono);
    font-size: 13px;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--color-primary);
    margin: 0 0 12px;
}
.hero-content h1 {
    font-size: clamp(28px, 4.2vw, 44px);
    margin-bottom: 16px;
}
.hero-lede {
    font-size: 17px;
    color: #D9EDEA;
    max-width: 560px;
    margin-bottom: 28px;
}
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }

.btn {
    display: inline-block;
    padding: 12px 24px;
    border-radius: 6px;
    font-weight: 600;
    font-size: 14px;
    text-decoration: none;
}
.btn:hover { text-decoration: none; }
.btn-primary { background: var(--color-accent); color: var(--color-white); }
.btn-primary:hover { background: #d14f21; }
.btn-outline { border: 1px solid rgba(255,255,255,0.5); color: var(--color-white); }
.btn-outline:hover { background: rgba(255,255,255,0.1); }

/* ---- Sections ---- */
.section { padding: 64px 0; }
.section-alt { background: var(--color-tint); }
.section-title { font-size: 26px; }
.section-intro { color: #4A6461; max-width: 620px; margin-bottom: 36px; }

.split {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
}
.split h2 { font-size: 20px; }
.split p { color: #3B5451; margin-bottom: 12px; }

.link-arrow {
    display: inline-block;
    font-weight: 600;
    margin-top: 4px;
    color: var(--color-primary-dark);
}

/* ---- Module rail (numbered curriculum) ---- */
.module-rail {
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0;
    counter-reset: module;
    border-top: 2px solid var(--color-ink);
}
.module {
    padding: 24px 20px 0 0;
    border-right: 1px solid var(--color-border);
}
.module:last-child { border-right: none; }
.module-num {
    display: block;
    font-family: var(--font-mono);
    font-size: 13px;
    color: var(--color-accent);
    font-weight: 500;
    margin-bottom: 10px;
}
.module h3 { font-size: 17px; margin-bottom: 8px; }
.module p { font-size: 14px; color: #4A6461; margin: 0; }

@media (max-width: 860px) {
    .module-rail { grid-template-columns: 1fr 1fr; }
    .module { border-right: none; border-bottom: 1px solid var(--color-border); padding-bottom: 20px; margin-bottom: 20px; }
    .split { grid-template-columns: 1fr; }
}
@media (max-width: 500px) {
    .module-rail { grid-template-columns: 1fr; }
    .hero { min-height: 460px; }
}

/* ---- Feature list (checkmark style) ---- */
.feature-list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px 24px;
}
.feature-list li {
    position: relative;
    padding-left: 26px;
    font-size: 15px;
    color: #3B5451;
}
.feature-list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 6px;
    width: 14px;
    height: 14px;
    border-radius: 3px;
    background: var(--color-primary);
}

/* ---- Service cards ---- */
.service-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}
.service-card {
    background: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: 10px;
    padding: 24px;
}
.service-card img {
    width: 100%;
    height: 140px;
    object-fit: cover;
    border-radius: 6px;
    margin-bottom: 14px;
    display: block;
}
.service-card h3 { font-size: 16px; margin-bottom: 8px; }
.service-card p { font-size: 14px; color: #4A6461; margin: 0; }

/* ---- Project cards ---- */
.project-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}
.project-card {
    background: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: 10px;
    padding: 28px;
    position: relative;
}
.project-card img {
    width: 100%;
    height: 190px;
    object-fit: cover;
    border-radius: 8px;
    margin-bottom: 16px;
    display: block;
}
.project-num {
    font-family: var(--font-mono);
    font-size: 13px;
    color: var(--color-accent);
    font-weight: 500;
    display: block;
    margin-bottom: 10px;
}
.project-card h3 { font-size: 18px; margin-bottom: 10px; }
.project-card ul {
    margin: 12px 0 0;
    padding-left: 18px;
    font-size: 14px;
    color: #3B5451;
}
.project-card ul li { margin-bottom: 4px; }
.project-card p { font-size: 14px; color: #4A6461; margin: 0 0 4px; }

/* ---- Stat row ---- */
.stat-row {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    border-top: 2px solid var(--color-ink);
    border-bottom: 1px solid var(--color-border);
    padding: 28px 0;
}
.stat { text-align: left; }
.stat-num {
    display: block;
    font-family: var(--font-display);
    font-size: 32px;
    font-weight: 800;
    color: var(--color-primary-dark);
}
.stat-label { font-size: 13px; color: #4A6461; }

/* ---- Tag pills (industries served) ---- */
.tag-row {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}
.tag-pill {
    background: var(--color-tint);
    border: 1px solid var(--color-border);
    color: var(--color-ink);
    font-size: 14px;
    font-weight: 600;
    padding: 8px 16px;
    border-radius: 999px;
}

/* ---- CTA band ---- */
.cta-band {
    background: var(--color-ink);
    color: var(--color-white);
    padding: 64px 0;
    text-align: center;
}
.cta-band h2 { color: var(--color-white); font-size: 28px; }
.cta-band p { color: #C8DEDB; max-width: 560px; margin: 0 auto 28px; }
.cta-band .hero-actions { justify-content: center; }

@media (max-width: 860px) {
    .service-grid { grid-template-columns: 1fr 1fr; }
    .project-grid { grid-template-columns: 1fr; }
    .stat-row { grid-template-columns: 1fr 1fr; }
    .feature-list { grid-template-columns: 1fr; }
}
@media (max-width: 500px) {
    .service-grid { grid-template-columns: 1fr; }
    .stat-row { grid-template-columns: 1fr; }
}

/* ---- Simple page header (no photo) ---- */
.page-header {
    background: var(--color-ink);
    padding: 56px 0 44px;
}
.page-header .hero-eyebrow { color: var(--color-primary); }
.page-header h1 { color: var(--color-white); font-size: clamp(26px, 3.6vw, 38px); margin-bottom: 12px; }
.page-header p { color: #C8DEDB; max-width: 620px; margin: 0; }

/* ---- Contact page ---- */
.contact-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}
.contact-card {
    background: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: 10px;
    padding: 22px;
    text-align: left;
}
.contact-card h4 {
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: #4A6461;
    margin-bottom: 8px;
}
.contact-card a, .contact-card p { font-size: 15px; font-weight: 600; color: var(--color-ink); margin: 0; }
.contact-card a:hover { color: var(--color-primary-dark); }

.map-embed {
    border: 1px solid var(--color-border);
    border-radius: 10px;
    overflow: hidden;
    margin-top: 32px;
}
.map-embed iframe { width: 100%; height: 360px; border: 0; display: block; }

@media (max-width: 860px) {
    .contact-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 500px) {
    .contact-grid { grid-template-columns: 1fr; }
}

/* ---- Contact form ---- */
.contact-form {
    max-width: 680px;
    background: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: 10px;
    padding: 32px;
}
.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}
.form-field { margin-bottom: 20px; }
.form-field label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: var(--color-ink);
    margin-bottom: 6px;
}
.form-field input[type="text"],
.form-field input[type="email"],
.form-field textarea {
    width: 100%;
    font-family: var(--font-body);
    font-size: 15px;
    color: var(--color-ink);
    background: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: 6px;
    padding: 10px 12px;
}
.form-field input:focus,
.form-field textarea:focus {
    outline: none;
    border-color: var(--color-primary);
}
.form-field textarea { resize: vertical; }
.form-field input[type="file"] {
    font-size: 14px;
    width: 100%;
}
.file-hint { font-size: 12px; color: #4A6461; margin: 6px 0 0; }

/* Honeypot — visually hidden but present in the DOM for bots to fill in */
.form-hp {
    position: absolute;
    left: -9999px;
    width: 1px;
    height: 1px;
    overflow: hidden;
}

.form-alert {
    border-radius: 8px;
    padding: 16px 18px;
    font-size: 14px;
    margin-bottom: 24px;
    max-width: 680px;
}
.form-alert-success {
    background: var(--color-tint);
    border: 1px solid var(--color-primary);
    color: var(--color-primary-dark);
    font-weight: 600;
}
.form-alert-error {
    background: #FBEAE3;
    border: 1px solid var(--color-accent);
    color: #A6421C;
}

@media (max-width: 600px) {
    .form-row { grid-template-columns: 1fr; }
    .contact-form { padding: 22px; }
}

/* ---- Photo grid (for pages showing real project photos) ---- */
.photo-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}
.photo-grid figure { margin: 0; }
.photo-grid img {
    width: 100%;
    height: 220px;
    object-fit: cover;
    border-radius: 10px;
    border: 1px solid var(--color-border);
}
.photo-grid figcaption {
    font-size: 13px;
    color: #4A6461;
    margin-top: 8px;
}
@media (max-width: 860px) {
    .photo-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 500px) {
    .photo-grid { grid-template-columns: 1fr; }
}

/* ---- Responsive ---- */
@media (max-width: 720px) {
    .header-bar { padding: 0 16px; gap: 10px; }
    .header-phone { font-size: 13px; }
    .site-nav ul { padding: 0 16px; gap: 18px; }
    .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 480px) {
    .footer-grid { grid-template-columns: 1fr; }
}