/* ===== CSS Variables ===== */
:root {
    --primary: #0a6e5c;
    --primary-dark: #085548;
    --primary-light: #e8f5f1;
    --accent: #1a8fc4;
    --bg: #f5f7fa;
    --bg-alt: #ffffff;
    --text: #1a1a2e;
    --text-light: #555;
    --text-muted: #888;
    --border: #e2e8f0;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
    --shadow-md: 0 4px 20px rgba(0,0,0,0.08);
    --shadow-lg: 0 10px 40px rgba(0,0,0,0.1);
    --radius: 12px;
    --radius-lg: 20px;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --max-width: 1200px;
    --header-height: 70px;
}

[data-theme="dark"] {
    --primary: #2dd4a8;
    --primary-dark: #25b892;
    --primary-light: #0d2b24;
    --accent: #5bbde8;
    --bg: #0f1117;
    --bg-alt: #1a1d2e;
    --text: #e8e8f0;
    --text-light: #a0a0b8;
    --text-muted: #666680;
    --border: #2a2d40;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.2);
    --shadow-md: 0 4px 20px rgba(0,0,0,0.3);
    --shadow-lg: 0 10px 40px rgba(0,0,0,0.4);
}

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

html { scroll-behavior: smooth; scroll-padding-top: calc(var(--header-height) + 20px); }

body {
    font-family: 'Noto Sans KR', -apple-system, BlinkMacSystemFont, sans-serif;
    color: var(--text);
    background: var(--bg);
    line-height: 1.7;
    transition: background var(--transition), color var(--transition);
    overflow-x: hidden;
}

a { text-decoration: none; color: inherit; transition: color var(--transition); }
img { max-width: 100%; display: block; }

/* ===== Top Bar ===== */
.top-bar {
    background: var(--text);
    color: #fff;
    font-size: 0.82rem;
    padding: 8px 0;
    transition: background var(--transition);
}

[data-theme="dark"] .top-bar { background: #0a0c14; }

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

.top-bar strong { color: var(--primary); font-weight: 700; }
[data-theme="dark"] .top-bar strong { color: var(--primary); }

.top-bar-links { display: flex; align-items: center; gap: 16px; }
.top-bar-links a { color: #ccc; font-size: 0.8rem; }
.top-bar-links a:hover { color: #fff; }

#theme-toggle {
    background: none;
    border: 1px solid rgba(255,255,255,0.2);
    color: #fff;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    cursor: pointer;
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition);
}
#theme-toggle:hover { border-color: rgba(255,255,255,0.5); }

/* ===== Header ===== */
.header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: var(--bg-alt);
    border-bottom: 1px solid var(--border);
    transition: all var(--transition);
}

.header.scrolled { box-shadow: var(--shadow-md); }

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

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo-icon {
    width: 40px;
    height: 40px;
    background: var(--primary);
    color: #fff;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 900;
}

.logo-text { display: flex; flex-direction: column; line-height: 1.2; }
.logo-text strong { font-size: 1.2rem; color: var(--text); }
.logo-text small { font-size: 0.6rem; color: var(--text-muted); letter-spacing: 2px; font-weight: 500; }

.nav { display: flex; gap: 32px; }
.nav a {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-light);
    position: relative;
    padding: 4px 0;
}
.nav a::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary);
    transition: width var(--transition);
}
.nav a:hover { color: var(--primary); }
.nav a:hover::after { width: 100%; }

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}
.mobile-menu-btn span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text);
    transition: all var(--transition);
    border-radius: 2px;
}

/* ===== Hero ===== */
.hero {
    position: relative;
    height: 560px;
    overflow: hidden;
}

.hero-slide {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    opacity: 0;
    transition: opacity 0.8s ease;
}

.hero-slide.active { opacity: 1; }

#slide-0 {
    background: linear-gradient(135deg, #0a6e5c 0%, #0d8a70 40%, #1a8fc4 100%);
}
#slide-1 {
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 40%, #0a6e5c 100%);
}

[data-theme="dark"] #slide-0 {
    background: linear-gradient(135deg, #071a15 0%, #0a2e26 40%, #0d3a52 100%);
}
[data-theme="dark"] #slide-1 {
    background: linear-gradient(135deg, #0a0c14 0%, #0f1117 40%, #071a15 100%);
}

.hero-content {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 48px;
    color: #fff;
}

.hero-sub {
    font-size: 1rem;
    font-weight: 400;
    letter-spacing: 3px;
    margin-bottom: 16px;
    opacity: 0.85;
}

.hero h1 {
    font-size: 3.2rem;
    font-weight: 900;
    line-height: 1.25;
    margin-bottom: 20px;
}

.hero-desc {
    font-size: 1.05rem;
    line-height: 1.8;
    opacity: 0.8;
    margin-bottom: 36px;
    font-weight: 300;
}

.hero-btn {
    display: inline-block;
    padding: 14px 36px;
    background: #fff;
    color: var(--primary-dark);
    font-weight: 700;
    font-size: 1rem;
    border-radius: 50px;
    transition: all var(--transition);
    box-shadow: 0 4px 15px rgba(0,0,0,0.15);
}
.hero-btn:hover { transform: translateY(-2px); box-shadow: 0 8px 25px rgba(0,0,0,0.2); }

[data-theme="dark"] .hero-btn { background: var(--primary); color: #fff; }

.hero-indicators {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 10px;
}

.indicator {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    border: 2px solid rgba(255,255,255,0.5);
    background: transparent;
    cursor: pointer;
    transition: all var(--transition);
}
.indicator.active { background: #fff; border-color: #fff; }

/* ===== Quick Menu ===== */
.quick-menu {
    margin-top: -40px;
    position: relative;
    z-index: 10;
    padding: 0 24px;
}

.quick-menu-inner {
    max-width: 800px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
}

.quick-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    padding: 28px 16px;
    background: var(--bg-alt);
    border-radius: var(--radius);
    box-shadow: var(--shadow-md);
    transition: all var(--transition);
    text-align: center;
}
.quick-item:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }

.quick-icon { font-size: 2rem; }
.quick-item span { font-size: 0.9rem; font-weight: 600; color: var(--text); }

/* ===== Sections Common ===== */
.section { padding: 100px 24px; }
.section:nth-child(even) { background: var(--bg); }
.section:nth-child(odd) { background: var(--bg-alt); }

.section-inner { max-width: var(--max-width); margin: 0 auto; }

.section-header { text-align: center; margin-bottom: 60px; }

.section-tag {
    display: inline-block;
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 3px;
    color: var(--primary);
    margin-bottom: 12px;
}

.section-header h2 {
    font-size: 2.2rem;
    font-weight: 800;
    color: var(--text);
    margin-bottom: 16px;
}

.section-desc {
    font-size: 1.05rem;
    color: var(--text-light);
    font-weight: 300;
}

/* ===== About ===== */
.about-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.about-card {
    padding: 36px 28px;
    background: var(--bg-alt);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    transition: all var(--transition);
}
.about-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); border-color: var(--primary); }

.about-number {
    font-size: 2.5rem;
    font-weight: 900;
    color: var(--primary);
    opacity: 0.3;
    margin-bottom: 16px;
    line-height: 1;
}

.about-card h3 {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--text);
}

.about-card p {
    font-size: 0.9rem;
    color: var(--text-light);
    line-height: 1.7;
}

/* ===== Centers ===== */
.centers-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.center-card {
    padding: 40px 30px;
    background: var(--bg-alt);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    text-align: center;
    transition: all var(--transition);
    position: relative;
    overflow: hidden;
}
.center-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--primary);
    transform: scaleX(0);
    transition: transform var(--transition);
}
.center-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
.center-card:hover::before { transform: scaleX(1); }

.center-icon { font-size: 3rem; margin-bottom: 20px; }

.center-card h3 {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 12px;
}

.center-card p {
    font-size: 0.88rem;
    color: var(--text-light);
    line-height: 1.7;
    margin-bottom: 16px;
}

.center-tag {
    font-size: 0.72rem;
    letter-spacing: 1px;
    color: var(--primary);
    font-weight: 600;
    opacity: 0.6;
}

/* ===== Doctors ===== */
.doctors-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}

.doctor-card {
    display: flex;
    gap: 24px;
    padding: 32px;
    background: var(--bg-alt);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    transition: all var(--transition);
}
.doctor-card:hover { box-shadow: var(--shadow-md); transform: translateY(-3px); }

.doctor-avatar {
    width: 72px;
    height: 72px;
    min-width: 72px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.6rem;
    font-weight: 800;
}

.doctor-info h3 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 4px;
}
.doctor-info h3 span {
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--primary);
    margin-left: 6px;
}

.doctor-specialty {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 12px;
    font-weight: 500;
}

.doctor-info ul {
    list-style: none;
    padding: 0;
}
.doctor-info li {
    font-size: 0.82rem;
    color: var(--text-light);
    padding: 2px 0;
    padding-left: 14px;
    position: relative;
}
.doctor-info li::before {
    content: '·';
    position: absolute;
    left: 0;
    color: var(--primary);
    font-weight: 900;
}

/* ===== Info ===== */
.info-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 28px;
}

.info-card {
    padding: 40px;
    background: var(--bg-alt);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    transition: all var(--transition);
}

.info-card h3 {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 24px;
    padding-bottom: 16px;
    border-bottom: 2px solid var(--primary);
}

.info-card table { width: 100%; border-collapse: collapse; }
.info-card td {
    padding: 14px 0;
    border-bottom: 1px solid var(--border);
    font-size: 0.95rem;
}
.info-card td:first-child { font-weight: 600; color: var(--text); width: 40%; }
.info-card td:last-child { color: var(--text-light); }
.info-card td.closed { color: #e53e3e; font-weight: 600; }
.info-card tr:last-child td { border-bottom: none; }

.info-notice {
    margin-top: 20px;
    font-size: 0.85rem;
    color: var(--primary);
    font-weight: 500;
}

.location-detail p {
    margin-bottom: 16px;
    font-size: 0.92rem;
    color: var(--text-light);
    line-height: 1.7;
}
.location-detail strong { color: var(--text); display: inline-block; margin-bottom: 4px; }

/* ===== Contact Form ===== */
.contact { background: var(--bg) !important; }

#contact-form {
    max-width: 700px;
    margin: 0 auto;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-bottom: 16px;
}

#contact-form input,
#contact-form textarea {
    width: 100%;
    padding: 14px 18px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 0.95rem;
    font-family: inherit;
    background: var(--bg-alt);
    color: var(--text);
    transition: all var(--transition);
    outline: none;
}
#contact-form textarea { margin-bottom: 16px; resize: vertical; }
#contact-form input:focus,
#contact-form textarea:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(10,110,92,0.1); }

[data-theme="dark"] #contact-form input:focus,
[data-theme="dark"] #contact-form textarea:focus { box-shadow: 0 0 0 3px rgba(45,212,168,0.15); }

#submit-btn {
    display: block;
    width: 100%;
    padding: 16px;
    background: var(--primary);
    color: #fff;
    border: none;
    border-radius: var(--radius);
    font-size: 1.05rem;
    font-weight: 700;
    font-family: inherit;
    cursor: pointer;
    transition: all var(--transition);
}
#submit-btn:hover { background: var(--primary-dark); transform: translateY(-1px); }
#submit-btn:disabled { opacity: 0.6; cursor: not-allowed; transform: none; }

#form-status {
    text-align: center;
    margin-top: 16px;
    font-size: 0.92rem;
    font-weight: 500;
    min-height: 24px;
}

/* ===== Footer ===== */
.footer {
    background: var(--text);
    color: #ccc;
    padding: 48px 24px 32px;
    transition: background var(--transition);
}

[data-theme="dark"] .footer { background: #0a0c14; }

.footer-inner { max-width: var(--max-width); margin: 0 auto; }

.footer-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: 28px;
    margin-bottom: 28px;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    color: #fff;
    font-size: 1.1rem;
}
.footer-brand .logo-icon {
    width: 34px;
    height: 34px;
    font-size: 1.2rem;
    border-radius: 8px;
}

.footer-links { display: flex; gap: 24px; }
.footer-links a { font-size: 0.85rem; color: #999; }
.footer-links a:first-child { color: #fff; font-weight: 600; }
.footer-links a:hover { color: #fff; }

.footer-bottom p {
    font-size: 0.82rem;
    color: #888;
    line-height: 1.9;
}

.copyright { margin-top: 16px; font-size: 0.78rem; color: #666; }

/* ===== Scroll Animations ===== */
.fade-up {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}
.fade-up.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
    .about-grid { grid-template-columns: repeat(2, 1fr); }
    .centers-grid { grid-template-columns: repeat(2, 1fr); }
    .doctors-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
    .nav { display: none; }
    .nav.open {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: var(--header-height);
        left: 0;
        right: 0;
        background: var(--bg-alt);
        padding: 20px 24px;
        gap: 16px;
        border-bottom: 1px solid var(--border);
        box-shadow: var(--shadow-md);
    }
    .mobile-menu-btn { display: flex; }

    .hero { height: 440px; }
    .hero h1 { font-size: 2.2rem; }
    .hero-content { padding: 0 24px; }
    .hero-desc br { display: none; }

    .quick-menu-inner { grid-template-columns: repeat(2, 1fr); gap: 12px; }
    .quick-item { padding: 20px 12px; }

    .section { padding: 60px 20px; }
    .section-header h2 { font-size: 1.7rem; }

    .about-grid { grid-template-columns: 1fr 1fr; }
    .centers-grid { grid-template-columns: 1fr; }
    .doctors-grid { grid-template-columns: 1fr; }
    .info-grid { grid-template-columns: 1fr; }

    .doctor-card { flex-direction: column; align-items: center; text-align: center; }
    .doctor-info li { text-align: left; }

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

    .footer-top { flex-direction: column; gap: 16px; }
    .footer-links { flex-wrap: wrap; justify-content: center; }
}

@media (max-width: 480px) {
    .hero { height: 400px; }
    .hero h1 { font-size: 1.8rem; }
    .hero-sub { font-size: 0.85rem; }
    .hero-desc { font-size: 0.9rem; }
    .about-grid { grid-template-columns: 1fr; }
    .quick-menu-inner { grid-template-columns: repeat(2, 1fr); }
}