/* ==============================================================================
 * AUTH & SUBPAGES DESIGN SYSTEM (auth-common.css)
 * Dark mode aesthetic matching freshgrad.site portfolio
 * ============================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

:root {
    --bg-dark: #0f172a;
    --bg-card: rgba(30, 41, 59, 0.7);
    --bg-card-border: rgba(255, 255, 255, 0.1);
    --bg-input: #1e293b;
    --border-input: #334155;
    
    --primary: #6366f1;
    --primary-hover: #4f46e5;
    --primary-glow: rgba(99, 102, 241, 0.35);
    
    --accent: #38bdf8;
    --accent-glow: rgba(56, 189, 248, 0.3);
    
    --success: #10b981;
    --error: #ef4444;
    --warning: #f59e0b;
    
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --text-dim: #64748b;
    
    --font-family: 'Inter', system-ui, -apple-system, sans-serif;
    --radius-lg: 16px;
    --radius-md: 10px;
    --radius-sm: 6px;
    
    --shadow-glow: 0 10px 30px -10px rgba(99, 102, 241, 0.25);
    --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: var(--font-family);
    background-color: var(--bg-dark);
    background-image: 
        radial-gradient(at 0% 0%, rgba(99, 102, 241, 0.12) 0px, transparent 50%),
        radial-gradient(at 100% 100%, rgba(56, 189, 248, 0.12) 0px, transparent 50%);
    background-attachment: fixed;
    color: var(--text-main);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ==============================================================================
 * TOP NAVIGATION BAR
 * ============================================================================== */

.app-header {
    width: 100%;
    background: rgba(15, 23, 42, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--bg-card-border);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 1rem 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.brand-logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
    color: var(--text-main);
    font-weight: 700;
    font-size: 1.2rem;
    letter-spacing: -0.02em;
}

.brand-logo span {
    background: linear-gradient(135deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    list-style: none;
}

.nav-links a {
    color: var(--text-muted);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    transition: var(--transition);
    padding: 0.4rem 0.8rem;
    border-radius: var(--radius-sm);
}

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

.nav-btn {
    background: linear-gradient(135deg, var(--primary), var(--primary-hover));
    color: white !important;
    font-weight: 600 !important;
    border-radius: var(--radius-md) !important;
    box-shadow: 0 4px 14px var(--primary-glow);
}

.nav-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 20px var(--primary-glow);
}

.btn-secondary {
    background: transparent;
    border: 1px solid var(--border-input);
    color: var(--text-main);
    padding: 0.5rem 1rem;
    border-radius: var(--radius-md);
    cursor: pointer;
    font-weight: 500;
    transition: var(--transition);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: var(--text-muted);
}

/* ==============================================================================
 * LAYOUT CONTAINER & GLASS CARDS
 * ============================================================================== */

.page-wrapper {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 2.5rem 1.5rem;
}

.glass-card {
    background: var(--bg-card);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--bg-card-border);
    border-radius: var(--radius-lg);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.35);
    padding: 2.5rem;
    width: 100%;
    max-width: 440px;
    animation: fadeIn 0.4s ease-out forwards;
}

.dashboard-card {
    max-width: 900px;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(12px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ==============================================================================
 * AUTH FORM STYLES
 * ============================================================================== */

.auth-header {
    text-align: center;
    margin-bottom: 2rem;
}

.auth-header h2 {
    font-size: 1.75rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 0.5rem;
}

.auth-header p {
    color: var(--text-muted);
    font-size: 0.92rem;
}

/* TAB SWITCHER */
.tab-switcher {
    display: flex;
    background: rgba(15, 23, 42, 0.6);
    border-radius: var(--radius-md);
    padding: 4px;
    margin-bottom: 1.75rem;
    border: 1px solid var(--bg-card-border);
}

.tab-btn {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--text-muted);
    padding: 0.6rem 1rem;
    font-size: 0.9rem;
    font-weight: 600;
    border-radius: calc(var(--radius-md) - 2px);
    cursor: pointer;
    transition: var(--transition);
}

.tab-btn.active {
    background: var(--primary);
    color: white;
    box-shadow: 0 4px 12px var(--primary-glow);
}

/* FORM ELEMENTS */
.form-group {
    margin-bottom: 1.25rem;
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.form-group label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.input-container {
    position: relative;
    display: flex;
    align-items: center;
}

.form-control {
    width: 100%;
    padding: 0.75rem 1rem;
    background: var(--bg-input);
    border: 1px solid var(--border-input);
    border-radius: var(--radius-md);
    color: var(--text-main);
    font-size: 0.95rem;
    font-family: inherit;
    transition: var(--transition);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-glow);
}

.toggle-pwd {
    position: absolute;
    right: 12px;
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 0.85rem;
    font-weight: 500;
}

.toggle-pwd:hover {
    color: var(--text-main);
}

.btn-primary {
    width: 100%;
    padding: 0.85rem;
    background: linear-gradient(135deg, var(--primary), var(--primary-hover));
    border: none;
    border-radius: var(--radius-md);
    color: white;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    box-shadow: 0 4px 14px var(--primary-glow);
    transition: var(--transition);
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 0.5rem;
    margin-top: 0.5rem;
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 20px var(--primary-glow);
}

.btn-primary:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

/* ALERTS & NOTIFICATIONS */
.alert-box {
    padding: 0.85rem 1rem;
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    margin-bottom: 1.25rem;
    display: flex;
    align-items: center;
    gap: 0.6rem;
    line-height: 1.4;
}

.alert-box.error {
    background: rgba(239, 68, 68, 0.15);
    border: 1px solid rgba(239, 68, 68, 0.3);
    color: #fca5a5;
}

.alert-box.success {
    background: rgba(16, 185, 129, 0.15);
    border: 1px solid rgba(16, 185, 129, 0.3);
    color: #6ee7b7;
}

.alert-box.warning {
    background: rgba(245, 158, 11, 0.15);
    border: 1px solid rgba(245, 158, 11, 0.3);
    color: #fcd34d;
}

.hidden {
    display: none !important;
}

/* ==============================================================================
 * DASHBOARD & SETTINGS STYLES
 * ============================================================================== */

.dashboard-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--bg-card-border);
}

.dashboard-header h1 {
    font-size: 2rem;
    font-weight: 800;
    letter-spacing: -0.03em;
}

.dashboard-header p {
    color: var(--text-muted);
    margin-top: 0.25rem;
}

.user-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.35rem 0.85rem;
    background: rgba(99, 102, 241, 0.15);
    border: 1px solid var(--primary-glow);
    border-radius: 999px;
    font-size: 0.82rem;
    color: #a5b4fc;
    font-weight: 600;
}

.grid-cols-2 {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
}

@media (max-width: 768px) {
    .grid-cols-2 {
        grid-template-columns: 1fr;
    }
}

.info-card {
    background: rgba(15, 23, 42, 0.5);
    border: 1px solid var(--bg-card-border);
    border-radius: var(--radius-md);
    padding: 1.5rem;
}

.info-card h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--accent);
}

.info-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    font-size: 0.9rem;
}

.info-item:last-child {
    border-bottom: none;
}

.info-item .label {
    color: var(--text-muted);
}

.info-item .value {
    font-weight: 600;
    color: var(--text-main);
    word-break: break-all;
}

/* SPINNER */
.spinner {
    width: 20px;
    height: 20px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 0.8s linear infinite;
}

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

/* FOOTER */
.app-footer {
    text-align: center;
    padding: 1.5rem;
    color: var(--text-dim);
    font-size: 0.85rem;
    border-top: 1px solid var(--bg-card-border);
    background: rgba(15, 23, 42, 0.5);
}