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

:root {
    --color-bg: #ffffff;
    --color-text: #1d1d1f;
    --color-text-secondary: #86868b;
    --color-accent: #0071e3;
    --color-accent-hover: #0077ED;
    --color-border: #d2d2d7;
    --color-card-bg: #f5f5f7;
    --color-nav-bg: rgba(255, 255, 255, 0.72);
    --font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'SF Pro Text', 'Helvetica Neue', 'PingFang SC', sans-serif;
    --max-width: 980px;
    --nav-height: 48px;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    color: var(--color-text);
    background: var(--color-bg);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a {
    color: var(--color-accent);
    text-decoration: none;
    transition: color 0.2s;
}

a:hover {
    color: var(--color-accent-hover);
}

/* ===== NAV ===== */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--nav-height);
    background: var(--color-nav-bg);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    z-index: 1000;
    border-bottom: 1px solid var(--color-border);
}

.nav-inner {
    max-width: var(--max-width);
    margin: 0 auto;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 22px;
}

.nav-logo {
    font-size: 18px;
    font-weight: 600;
    color: var(--color-text);
    letter-spacing: -0.01em;
}

.nav-logo:hover {
    color: var(--color-text);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 28px;
    list-style: none;
}

.nav-links a {
    font-size: 12px;
    color: var(--color-text);
    opacity: 0.8;
    transition: opacity 0.2s;
}

.nav-links a:hover,
.nav-links a.active {
    opacity: 1;
    color: var(--color-text);
}

.lang-switch {
    font-size: 12px;
    color: var(--color-accent);
    cursor: pointer;
    padding: 4px 10px;
    border: 1px solid var(--color-accent);
    border-radius: 20px;
    transition: all 0.2s;
    background: transparent;
}

.lang-switch:hover {
    background: var(--color-accent);
    color: #fff;
}

/* ===== HERO ===== */
.hero {
    padding-top: calc(var(--nav-height) + 100px);
    padding-bottom: 80px;
    text-align: center;
}

.hero h1 {
    font-size: 56px;
    font-weight: 700;
    letter-spacing: -0.03em;
    line-height: 1.07;
    margin-bottom: 16px;
}

.hero p {
    font-size: 21px;
    color: var(--color-text-secondary);
    max-width: 600px;
    margin: 0 auto;
    font-weight: 400;
    line-height: 1.3;
}

/* ===== SECTION ===== */
.section {
    padding: 80px 22px;
    max-width: var(--max-width);
    margin: 0 auto;
}

.section-title {
    font-size: 40px;
    font-weight: 700;
    letter-spacing: -0.02em;
    text-align: center;
    margin-bottom: 12px;
}

.section-subtitle {
    font-size: 17px;
    color: var(--color-text-secondary);
    text-align: center;
    margin-bottom: 48px;
}

/* ===== CARDS GRID ===== */
.cards {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
}

.card {
    background: var(--color-card-bg);
    border-radius: 18px;
    padding: 32px;
    border: 1px solid transparent;
    transition: transform 0.3s, box-shadow 0.3s, border-color 0.3s;
    cursor: default;
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.08);
    border-color: var(--color-border);
}

.card-link {
    display: block;
    text-decoration: none;
    color: inherit;
    cursor: pointer;
}

.card-link:hover {
    color: inherit;
}

.card-link h3::after {
    content: ' →';
    font-weight: 400;
    opacity: 0;
    transition: opacity 0.2s;
}

.card-link:hover h3::after {
    opacity: 0.5;
}

.card h3 {
    font-size: 21px;
    font-weight: 600;
    margin-bottom: 8px;
    letter-spacing: -0.01em;
}

.card p {
    font-size: 14px;
    color: var(--color-text-secondary);
    line-height: 1.5;
}

.card-date {
    font-size: 12px;
    color: var(--color-text-secondary);
    margin-top: 12px;
    opacity: 0.7;
}

/* ===== MEMBERS ===== */
.members-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 20px;
}

.member-card {
    text-align: center;
    padding: 32px 20px;
    background: var(--color-card-bg);
    border-radius: 18px;
    transition: transform 0.3s;
}

.member-card:hover {
    transform: translateY(-4px);
}

.member-avatar {
    width: 88px;
    height: 88px;
    border-radius: 50%;
    background: linear-gradient(135deg, #667eea, #764ba2);
    margin: 0 auto 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 32px;
    color: #fff;
    font-weight: 600;
    overflow: hidden;
    position: relative;
}

.member-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 50%;
}

.member-card h3 {
    font-size: 17px;
    font-weight: 600;
    margin-bottom: 4px;
}

.member-card .role {
    font-size: 13px;
    color: var(--color-text-secondary);
}

/* ===== FOOTER ===== */
.footer {
    text-align: center;
    padding: 40px 22px;
    border-top: 1px solid var(--color-border);
    color: var(--color-text-secondary);
    font-size: 12px;
}

/* ===== ADMIN ===== */
.admin-container {
    max-width: 480px;
    margin: 0 auto;
    padding: 120px 22px 80px;
}

.admin-container h1 {
    font-size: 32px;
    font-weight: 700;
    text-align: center;
    margin-bottom: 32px;
}

.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    font-size: 13px;
    font-weight: 500;
    margin-bottom: 6px;
    color: var(--color-text);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    font-size: 15px;
    border: 1px solid var(--color-border);
    border-radius: 12px;
    outline: none;
    transition: border-color 0.2s;
    font-family: var(--font-family);
    background: var(--color-card-bg);
}

.form-group input:focus,
.form-group textarea:focus {
    border-color: var(--color-accent);
}

.form-group textarea {
    resize: vertical;
    min-height: 100px;
}

.btn {
    display: inline-block;
    padding: 12px 24px;
    font-size: 15px;
    font-weight: 500;
    border: none;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.2s;
    font-family: var(--font-family);
}

.btn-primary {
    background: var(--color-accent);
    color: #fff;
    width: 100%;
}

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

.btn-danger {
    background: #ff3b30;
    color: #fff;
}

.btn-danger:hover {
    background: #e0342a;
}

.btn-small {
    padding: 6px 14px;
    font-size: 12px;
    border-radius: 8px;
}

/* ===== ADMIN DASHBOARD ===== */
.admin-dashboard {
    max-width: 680px;
    margin: 0 auto;
    padding: 100px 22px 80px;
}

.admin-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 32px;
}

.admin-header h1 {
    font-size: 28px;
    font-weight: 700;
}

.admin-list {
    list-style: none;
}

.admin-list-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 20px;
    background: var(--color-card-bg);
    border-radius: 12px;
    margin-bottom: 10px;
}

.admin-list-item h4 {
    font-size: 15px;
    font-weight: 600;
}

.admin-list-item p {
    font-size: 13px;
    color: var(--color-text-secondary);
    margin-top: 2px;
}

.admin-list-item .actions {
    display: flex;
    gap: 8px;
}

.error-msg {
    color: #ff3b30;
    font-size: 13px;
    text-align: center;
    margin-top: 12px;
    display: none;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 36px;
    }
    .hero p {
        font-size: 17px;
    }
    .section-title {
        font-size: 28px;
    }
    .nav-links {
        gap: 16px;
    }
    .cards {
        grid-template-columns: 1fr;
    }
    .members-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}