/* 
 * 風行網球 Fashion Tennis - Design System v5.0
 * Professional Tennis Academy Website
 */

:root {
    --primary: #0f172a;
    --primary-light: #1e293b;
    --primary-dark: #020617;
    --accent: #10b981;
    --accent-hover: #059669;
    --accent-light: #34d399;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --text-dark: #64748b;
    --border-color: rgba(255, 255, 255, 0.08);
    --card-bg: rgba(30, 41, 59, 0.5);
    --shadow-color: rgba(0, 0, 0, 0.25);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
    background: linear-gradient(180deg, var(--primary) 0%, var(--primary-dark) 100%);
    background-attachment: fixed;
    color: var(--text-main);
    font-family: 'Inter', 'Noto Sans TC', -apple-system, BlinkMacSystemFont, sans-serif;
    -webkit-font-smoothing: antialiased;
    -webkit-tap-highlight-color: transparent;
    line-height: 1.6;
}

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

img { max-width: 100%; height: auto; }

h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    color: var(--text-main);
}

.text-gradient {
    background: linear-gradient(135deg, var(--accent) 0%, var(--accent-light) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 24px;
    transition: all 0.3s ease;
}

.card:hover {
    border-color: rgba(16, 185, 129, 0.3);
    transform: translateY(-4px);
    box-shadow: 0 20px 40px var(--shadow-color);
}

.glass-card {
    background: rgba(30, 41, 59, 0.6);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 24px;
    box-shadow: 0 8px 32px var(--shadow-color);
    transition: all 0.3s ease;
}

@media (max-width: 768px) {
    .glass-card {
        backdrop-filter: blur(10px);
        -webkit-backdrop-filter: blur(10px);
        background: rgba(30, 41, 59, 0.9);
        padding: 20px;
    }
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 14px;
    font-weight: 600;
    color: var(--text-muted);
    margin-bottom: 8px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

input, select, textarea {
    width: 100%;
    background: rgba(15, 23, 42, 0.8);
    border: 2px solid var(--border-color);
    color: var(--text-main);
    padding: 14px 18px;
    border-radius: 12px;
    outline: none;
    font-size: 16px;
    font-family: inherit;
    transition: all 0.3s ease;
}

input:focus, select:focus, textarea:focus {
    border-color: var(--accent);
    background: rgba(15, 23, 42, 1);
    box-shadow: 0 0 0 4px rgba(16, 185, 129, 0.1);
}

input::placeholder, textarea::placeholder {
    color: var(--text-dark);
}

select {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%2394a3b8'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M19 9l-7 7-7-7'%3E%3C/path%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 16px center;
    background-size: 20px;
    padding-right: 48px;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 28px;
    border-radius: 12px;
    font-weight: 600;
    font-size: 15px;
    font-family: inherit;
    cursor: pointer;
    border: none;
    transition: all 0.2s ease;
    text-decoration: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent) 0%, #059669 100%);
    color: white;
    box-shadow: 0 4px 20px rgba(16, 185, 129, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(16, 185, 129, 0.5);
    color: white;
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-secondary {
    background: var(--primary-light);
    color: var(--text-main);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background: rgba(30, 41, 59, 0.8);
    border-color: var(--accent);
    color: white;
}

.btn-outline {
    background: transparent;
    border: 2px solid rgba(255, 255, 255, 0.2);
    color: white;
}

.btn-outline:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.4);
    color: white;
}

.btn-ghost {
    background: transparent;
    color: var(--text-muted);
    padding: 10px 16px;
}

.btn-ghost:hover {
    color: var(--accent);
    background: rgba(16, 185, 129, 0.1);
}

.btn-lg {
    padding: 18px 36px;
    font-size: 17px;
    border-radius: 14px;
}

.btn-sm {
    padding: 10px 20px;
    font-size: 13px;
}

.btn-icon {
    width: 48px;
    height: 48px;
    padding: 0;
    border-radius: 12px;
}

.nav-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 10px 16px;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-muted);
    border-radius: 10px;
    transition: all 0.2s ease;
}

.nav-link:hover {
    color: var(--text-main);
    background: rgba(255, 255, 255, 0.05);
}

.nav-link.active {
    color: var(--accent);
    background: rgba(16, 185, 129, 0.1);
}

.mobile-nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px 20px;
    font-size: 16px;
    font-weight: 500;
    color: var(--text-main);
    border-radius: 12px;
    transition: all 0.2s ease;
}

.mobile-nav-item:hover {
    background: rgba(255, 255, 255, 0.05);
    color: var(--accent);
}

table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
}

th {
    background: rgba(255, 255, 255, 0.03);
    color: var(--text-muted);
    font-weight: 600;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    padding: 14px 16px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

td {
    padding: 16px;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-main);
    font-size: 14px;
}

tr:hover td {
    background: rgba(255, 255, 255, 0.02);
}

@media (max-width: 768px) {
    table, thead, tbody, th, td, tr { display: block; }
    thead tr { display: none; }
    tr {
        margin-bottom: 16px;
        background: var(--card-bg);
        border-radius: 12px;
        border: 1px solid var(--border-color);
        padding: 16px;
    }
    td {
        padding: 10px 0;
        border: none;
        display: flex;
        justify-content: space-between;
        align-items: center;
    }
    td:before {
        content: attr(data-label);
        font-weight: 600;
        font-size: 11px;
        text-transform: uppercase;
        color: var(--text-muted);
        letter-spacing: 0.5px;
    }
}

.badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    font-size: 12px;
    font-weight: 600;
    border-radius: 8px;
    text-transform: uppercase;
    letter-spacing: 0.3px;
}

.badge-success {
    background: rgba(16, 185, 129, 0.15);
    color: #34d399;
}

.badge-warning {
    background: rgba(245, 158, 11, 0.15);
    color: #fbbf24;
}

.badge-danger {
    background: rgba(239, 68, 68, 0.15);
    color: #f87171;
}

.badge-info {
    background: rgba(59, 130, 246, 0.15);
    color: #60a5fa;
}

.alert {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px 20px;
    border-radius: 12px;
    font-size: 14px;
    margin-bottom: 20px;
}

.alert-success {
    background: rgba(16, 185, 129, 0.1);
    border: 1px solid rgba(16, 185, 129, 0.2);
    color: #34d399;
}

.alert-error {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.2);
    color: #f87171;
}

.alert-warning {
    background: rgba(245, 158, 11, 0.1);
    border: 1px solid rgba(245, 158, 11, 0.2);
    color: #fbbf24;
}

.alert-info {
    background: rgba(59, 130, 246, 0.1);
    border: 1px solid rgba(59, 130, 246, 0.2);
    color: #60a5fa;
}

.page-header {
    margin-bottom: 32px;
}

.page-title {
    font-size: 28px;
    font-weight: 800;
    color: var(--text-main);
    margin-bottom: 8px;
}

.page-subtitle {
    font-size: 16px;
    color: var(--text-muted);
}

.stat-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 24px;
    text-align: center;
}

.stat-value {
    font-size: 36px;
    font-weight: 800;
    color: var(--accent);
    line-height: 1;
    margin-bottom: 8px;
}

.stat-label {
    font-size: 14px;
    color: var(--text-muted);
}

.container {
    width: 100%;
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
}

.section {
    padding: 80px 0;
}

.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mb-0 { margin-bottom: 0; }
.mb-4 { margin-bottom: 16px; }
.mb-8 { margin-bottom: 32px; }
.mb-12 { margin-bottom: 48px; }

.mt-0 { margin-top: 0; }
.mt-4 { margin-top: 16px; }
.mt-8 { margin-top: 32px; }

.hidden { display: none; }

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.animate-fade-in {
    animation: fadeIn 0.5s ease forwards;
}

.animate-pulse {
    animation: pulse 2s infinite;
}

.animate-spin {
    animation: spin 1s linear infinite;
}

::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--primary);
}

::-webkit-scrollbar-thumb {
    background: var(--primary-light);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #475569;
}

::selection {
    background: var(--accent);
    color: white;
}