/* TechDesc Service — Industrial Design */
:root {
    --primary: #1a5276;
    --primary-light: #2980b9;
    --accent: #e67e22;
    --bg: #f5f6fa;
    --card: #ffffff;
    --text: #2c3e50;
    --text-light: #7f8c8d;
    --border: #dce1e8;
    --success: #27ae60;
    --danger: #c0392b;
    --shadow: 0 2px 8px rgba(0,0,0,0.08);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
}

/* Login Page */
.login-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: linear-gradient(135deg, var(--primary) 0%, #0d3b56 100%);
}
.login-card {
    background: var(--card);
    border-radius: 12px;
    padding: 40px;
    width: 400px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.3);
}
.login-card h1 {
    text-align: center;
    color: var(--primary);
    margin-bottom: 8px;
    font-size: 24px;
}
.login-card .subtitle {
    text-align: center;
    color: var(--text-light);
    margin-bottom: 30px;
    font-size: 14px;
}
.login-card .icon {
    text-align: center;
    font-size: 48px;
    margin-bottom: 15px;
}

/* Forms */
.form-group {
    margin-bottom: 18px;
}
.form-group label {
    display: block;
    font-weight: 600;
    margin-bottom: 6px;
    font-size: 14px;
    color: var(--text);
}
.form-group input, .form-group select, .form-group textarea {
    width: 100%;
    padding: 10px 14px;
    border: 2px solid var(--border);
    border-radius: 8px;
    font-size: 15px;
    transition: border-color 0.2s;
    background: #fff;
}
.form-group input:focus, .form-group select:focus, .form-group textarea:focus {
    outline: none;
    border-color: var(--primary-light);
    box-shadow: 0 0 0 3px rgba(41,128,185,0.1);
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 10px 24px;
    border: none;
    border-radius: 8px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    text-decoration: none;
    text-align: center;
}
.btn-primary {
    background: var(--primary);
    color: #fff;
    width: 100%;
}
.btn-primary:hover { background: var(--primary-light); }
.btn-accent {
    background: var(--accent);
    color: #fff;
}
.btn-accent:hover { background: #d35400; transform: translateY(-1px); }
.btn-outline {
    background: transparent;
    border: 2px solid var(--border);
    color: var(--text);
}
.btn-outline:hover { border-color: var(--primary); color: var(--primary); }
.btn-danger { background: var(--danger); color: #fff; }
.btn-danger:hover { background: #a93226; }
.btn-success { background: var(--success); color: #fff; }
.btn-sm { padding: 6px 14px; font-size: 13px; }

/* Header / Navbar */
.navbar {
    background: var(--primary);
    padding: 0 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 60px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.15);
}
.navbar .brand {
    color: #fff;
    font-size: 18px;
    font-weight: 700;
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 10px;
}
.navbar .nav-right {
    display: flex;
    align-items: center;
    gap: 15px;
}
.navbar .nav-right a {
    color: rgba(255,255,255,0.85);
    text-decoration: none;
    font-size: 14px;
    padding: 6px 12px;
    border-radius: 6px;
    transition: all 0.2s;
}
.navbar .nav-right a:hover { background: rgba(255,255,255,0.15); color: #fff; }
.navbar .user-badge {
    background: rgba(255,255,255,0.2);
    padding: 4px 12px;
    border-radius: 20px;
    color: #fff;
    font-size: 13px;
}

/* Layout */
.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 30px 20px;
}

/* Cards */
.card {
    background: var(--card);
    border-radius: 12px;
    padding: 28px;
    box-shadow: var(--shadow);
    margin-bottom: 24px;
}
.card h2 {
    color: var(--primary);
    margin-bottom: 20px;
    font-size: 20px;
    display: flex;
    align-items: center;
    gap: 10px;
}

/* Generate form */
.generate-form {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 18px;
}
.generate-form .full-width { grid-column: 1 / -1; }
.generate-form .actions {
    grid-column: 1 / -1;
    display: flex;
    justify-content: flex-end;
    gap: 10px;
}

/* History Table */
.history-table {
    width: 100%;
    border-collapse: collapse;
}
.history-table th {
    background: var(--bg);
    padding: 10px 14px;
    text-align: left;
    font-size: 12px;
    text-transform: uppercase;
    color: var(--text-light);
    font-weight: 600;
    border-bottom: 2px solid var(--border);
}
.history-table td {
    padding: 12px 14px;
    border-bottom: 1px solid var(--border);
    font-size: 14px;
}
.history-table tr:hover { background: #f8f9fb; }
.badge {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 12px;
    font-size: 11px;
    font-weight: 600;
}
.badge-tm { background: #d4e6f1; color: var(--primary); }
.badge-sg { background: #d5f5e3; color: #1b4332; }

/* Result Page */
.result-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}
.result-content {
    line-height: 1.7;
    font-size: 15px;
}
.result-content p { margin-bottom: 12px; }
.specs-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 10px;
    margin: 15px 0;
}
.spec-item {
    background: var(--bg);
    padding: 10px 14px;
    border-radius: 8px;
    border-left: 3px solid var(--primary-light);
}
.spec-item .key { font-size: 12px; color: var(--text-light); }
.spec-item .val { font-weight: 600; margin-top: 2px; }

/* Loading spinner */
.loading {
    display: none;
    text-align: center;
    padding: 40px;
}
.loading.active { display: block; }
.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--border);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin: 0 auto 15px;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* Error */
.alert {
    padding: 12px 18px;
    border-radius: 8px;
    margin-bottom: 18px;
    font-size: 14px;
}
.alert-error { background: #fdecea; color: var(--danger); border: 1px solid #f5c6cb; }
.alert-success { background: #d4edda; color: #155724; border: 1px solid #c3e6cb; }

/* Admin */
.admin-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}
.stat-card {
    text-align: center;
    padding: 20px;
}
.stat-card .number {
    font-size: 36px;
    font-weight: 700;
    color: var(--primary);
}
.stat-card .label {
    color: var(--text-light);
    font-size: 13px;
    margin-top: 5px;
}

/* Responsive */
@media (max-width: 768px) {
    .generate-form { grid-template-columns: 1fr; }
    .admin-grid { grid-template-columns: 1fr; }
    .navbar { padding: 0 15px; }
    .container { padding: 15px; }
    .login-card { width: 90%; padding: 25px; }
}