:root {
    --primary: #4f46e5;
    --primary-dark: #4338ca;
    --primary-light: #e0e7ff;
    --primary-glow: rgba(79,70,229,0.35);
    --accent: #06b6d4;
    --accent-light: #cffafe;
    --gray-50: #f8fafc;
    --gray-100: #f1f5f9;
    --gray-200: #e2e8f0;
    --gray-300: #cbd5e1;
    --gray-400: #94a3b8;
    --gray-500: #64748b;
    --gray-600: #475569;
    --gray-700: #334155;
    --gray-800: #1e293b;
    --gray-900: #0f172a;
    --success: #10b981;
    --success-light: #d1fae5;
    --danger: #ef4444;
    --danger-light: #fee2e2;
    --warning: #f59e0b;
    --radius: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --shadow: 0 1px 3px rgba(0,0,0,0.06), 0 6px 16px rgba(0,0,0,0.04);
    --shadow-md: 0 4px 20px rgba(0,0,0,0.08), 0 1px 4px rgba(0,0,0,0.04);
    --shadow-lg: 0 12px 40px rgba(0,0,0,0.12), 0 4px 12px rgba(0,0,0,0.06);
    --shadow-glow: 0 0 20px var(--primary-glow);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    color: var(--gray-800);
    background: linear-gradient(160deg, #c7d2fe 0%, #bae6fd 30%, #cbd5e1 60%, #ddd6fe 100%);
    background-attachment: fixed;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    min-height: 100vh;
}

a { color: var(--primary); text-decoration: none; transition: color 0.15s; }
a:hover { color: var(--primary-dark); }

.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 11px 22px;
    border: none;
    border-radius: var(--radius);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    text-decoration: none;
    white-space: nowrap;
    letter-spacing: 0.01em;
    position: relative;
    overflow: hidden;
}
.btn::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, rgba(255,255,255,0.15) 0%, transparent 50%);
    pointer-events: none;
}
.btn:active { transform: scale(0.96); }
.btn-primary {
    background: linear-gradient(135deg, #818cf8 0%, #a78bfa 100%);
    color: #fff;
    box-shadow: 0 3px 12px rgba(129,140,248,0.3), 0 1px 3px rgba(0,0,0,0.1);
}
.btn-primary:hover {
    background: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
    color: #fff;
    box-shadow: 0 6px 20px rgba(129,140,248,0.4), 0 2px 6px rgba(0,0,0,0.1);
    transform: translateY(-1px);
}
.btn-secondary {
    background: linear-gradient(135deg, #fff 0%, var(--gray-50) 100%);
    color: var(--gray-700);
    border: 1px solid var(--gray-300);
    box-shadow: 0 1px 4px rgba(0,0,0,0.06);
}
.btn-secondary:hover {
    background: linear-gradient(135deg, var(--gray-50) 0%, var(--gray-100) 100%);
    border-color: var(--gray-400);
    transform: translateY(-1px);
    box-shadow: 0 3px 10px rgba(0,0,0,0.08);
}
.btn-danger {
    background: linear-gradient(135deg, var(--danger) 0%, #dc2626 100%);
    color: #fff;
    box-shadow: 0 3px 12px rgba(239,68,68,0.35), 0 1px 3px rgba(0,0,0,0.1);
}
.btn-danger:hover {
    background: linear-gradient(135deg, #dc2626 0%, #b91c1c 100%);
    color: #fff;
    box-shadow: 0 6px 20px rgba(239,68,68,0.4);
    transform: translateY(-1px);
}
.btn-sm { padding: 7px 16px; font-size: 13px; }
.btn-icon { padding: 7px 12px; }
.btn-disabled {
    background: var(--gray-100);
    color: var(--gray-400);
    cursor: not-allowed;
    border: 1px solid var(--gray-200);
    box-shadow: none;
}
.btn-disabled::after { display: none; }
.btn-disabled:hover { background: var(--gray-100); color: var(--gray-400); transform: none; box-shadow: none; }
.btn-disabled:active { transform: none; }

/* Forms */
.form-group { margin-bottom: 18px; }
.form-group label {
    display: block;
    font-size: 12px;
    font-weight: 700;
    color: var(--gray-500);
    margin-bottom: 6px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}
.form-control {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--gray-200);
    border-radius: var(--radius);
    font-size: 15px;
    transition: all 0.2s;
    background: #fff;
    color: var(--gray-800);
}
.form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(79,70,229,0.1);
}
select.form-control { appearance: auto; }
textarea.form-control { resize: vertical; min-height: 80px; }

/* Cards */
.card {
    background: rgba(255,255,255,0.9);
    backdrop-filter: blur(12px);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    padding: 28px;
    border: 1px solid rgba(255,255,255,0.6);
}

/* Alerts */
.alert {
    padding: 14px 20px;
    border-radius: var(--radius);
    margin-bottom: 16px;
    font-size: 14px;
    font-weight: 600;
    backdrop-filter: blur(8px);
}
.alert-error { background: var(--danger-light); color: var(--danger); border: 1px solid #fecaca; }
.alert-success { background: var(--success-light); color: var(--success); border: 1px solid #a7f3d0; }

/* Navigation */
.navbar {
    background: rgba(255,255,255,0.85);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(0,0,0,0.06);
    padding: 14px 0;
    position: sticky;
    top: 0;
    z-index: 50;
}
.navbar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.navbar-brand {
    font-size: 22px;
    font-weight: 800;
    color: var(--gray-900);
    letter-spacing: -0.5px;
}
.navbar-brand span {
    background: linear-gradient(135deg, var(--primary) 0%, #7c3aed 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.navbar-links { display: flex; align-items: center; gap: 16px; }
.navbar-links a { color: var(--gray-600); font-size: 14px; font-weight: 500; }
.navbar-links a.btn-primary { color: #fff; -webkit-text-fill-color: #fff; }
.navbar-links a.btn-primary:hover { color: #fff; -webkit-text-fill-color: #fff; }
.navbar-links a:hover { color: var(--primary); }
.navbar-user { color: var(--gray-500); font-size: 13px; text-decoration: none; }
a.navbar-user:hover { color: var(--gray-800); }

/* Burger Button — hidden on desktop */
.burger { display: none; }

/* Landing Page */
.hero {
    text-align: center;
    padding: 100px 20px;
    background: linear-gradient(135deg, #1e1b4b 0%, var(--primary) 50%, #7c3aed 100%);
    color: #fff;
    position: relative;
    overflow: hidden;
}
.hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse at 30% 50%, rgba(6,182,212,0.2) 0%, transparent 70%),
                radial-gradient(ellipse at 70% 50%, rgba(124,58,237,0.2) 0%, transparent 70%);
}
.hero h1 { font-size: 52px; margin-bottom: 16px; font-weight: 800; position: relative; letter-spacing: -1px; }
.hero p { font-size: 20px; opacity: 0.9; max-width: 600px; margin: 0 auto 36px; position: relative; }
.hero .btn-primary {
    background: #fff;
    color: var(--primary);
    padding: 16px 36px;
    font-size: 16px;
    font-weight: 700;
    box-shadow: 0 4px 20px rgba(0,0,0,0.2);
    position: relative;
}
.hero .btn-primary:hover { background: var(--gray-100); color: var(--primary-dark); }

.features {
    padding: 80px 20px;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 32px;
    max-width: 1000px;
    margin: 0 auto;
}
.feature {
    text-align: center;
    padding: 36px 28px;
    border-radius: var(--radius-lg);
    background: rgba(255,255,255,0.7);
    backdrop-filter: blur(8px);
    border: 1px solid rgba(255,255,255,0.5);
    transition: transform 0.2s, box-shadow 0.2s;
}
.feature:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.feature-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary-light) 0%, #ede9fe 100%);
    color: var(--primary);
    border-radius: 16px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 26px;
    margin-bottom: 18px;
}
.feature h3 { margin-bottom: 10px; color: var(--gray-900); font-weight: 700; }
.feature p { color: var(--gray-500); font-size: 15px; line-height: 1.7; }

.footer {
    text-align: center;
    padding: 32px 20px;
    color: var(--gray-400);
    font-size: 13px;
    border-top: 1px solid var(--gray-200);
}

/* Login Page */
.login-wrapper {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(160deg, #eef2ff 0%, #f0f9ff 50%, #faf5ff 100%);
}
.login-card {
    width: 100%;
    max-width: 420px;
    padding: 44px;
}
.login-card h1 {
    text-align: center;
    margin-bottom: 8px;
    font-size: 26px;
    font-weight: 800;
}
.login-card .subtitle {
    text-align: center;
    color: var(--gray-500);
    margin-bottom: 32px;
    font-size: 14px;
}

/* Utilities */
.text-center { text-align: center; }
.text-muted { color: var(--gray-500); }
.mt-2 { margin-top: 8px; }
.mt-4 { margin-top: 16px; }
.mb-4 { margin-bottom: 16px; }
.flex { display: flex; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-2 { gap: 8px; }
.gap-4 { gap: 16px; }

@media (max-width: 768px) {
    .container { padding: 0 16px; }
    .hero h1 { font-size: 34px; }
    .hero p { font-size: 16px; }
    .features { grid-template-columns: 1fr; padding: 40px 16px; }
    .card { padding: 20px; }
    .navbar { padding: 12px 0; }

    /* Burger button */
    .burger {
        display: flex;
        flex-direction: column;
        justify-content: center;
        gap: 5px;
        width: 36px;
        height: 36px;
        background: none;
        border: none;
        cursor: pointer;
        padding: 6px;
        border-radius: 8px;
        transition: background 0.2s;
        z-index: 60;
    }
    .burger:hover { background: var(--gray-100); }
    .burger span {
        display: block;
        width: 100%;
        height: 2.5px;
        background: var(--gray-700);
        border-radius: 2px;
        transition: all 0.3s ease;
        transform-origin: center;
    }
    .burger.open span:nth-child(1) {
        transform: translateY(7.5px) rotate(45deg);
    }
    .burger.open span:nth-child(2) {
        opacity: 0;
    }
    .burger.open span:nth-child(3) {
        transform: translateY(-7.5px) rotate(-45deg);
    }

    /* Mobile nav dropdown (logged-in only) */
    .navbar-collapse {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        flex-direction: column;
        background: rgba(255,255,255,0.97);
        backdrop-filter: blur(20px);
        border-bottom: 1px solid rgba(0,0,0,0.08);
        box-shadow: 0 12px 32px rgba(0,0,0,0.1);
        padding: 8px 16px 16px;
        gap: 0;
    }
    .navbar-collapse.open {
        display: flex;
    }
    .navbar-collapse a {
        padding: 14px 16px;
        font-size: 16px;
        font-weight: 600;
        border-radius: var(--radius);
        transition: background 0.15s;
    }
    .navbar-collapse a:hover {
        background: var(--gray-50);
    }
    .navbar .container {
        position: relative;
    }
}