/* ==========================================================
   PREMIUM LIGHT THEME — Base Design System
   ========================================================== */
:root {
    --color-primary: #1e3a8a;      /* Navy */
    --color-primary-light: #3b82f6; /* Blue */
    --color-bg: #ffffff;
    --color-bg-soft: #f5f8ff;      /* soft blue-white */
    --color-section: #eef3fc;      /* light blue-gray section bg */
    --color-text: #1f2937;
    --color-text-muted: #6b7280;
    --color-border: #e2e8f0;
    --color-success: #16a34a;
    --color-danger: #dc2626;
    --radius-md: 12px;
    --radius-lg: 20px;
    --shadow-card: 0 4px 20px rgba(30, 58, 138, 0.08);
    --shadow-hover: 0 8px 30px rgba(30, 58, 138, 0.14);
    --font-base: 'Segoe UI', 'Noto Sans Bengali', system-ui, sans-serif;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: var(--font-base);
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
}

a { text-decoration: none; color: inherit; }

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ---- Buttons ---- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 24px;
    border-radius: var(--radius-md);
    border: none;
    font-weight: 600;
    font-size: 15px;
    cursor: pointer;
    transition: all 0.2s ease;
}
.btn-primary {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
    color: #fff;
    box-shadow: var(--shadow-card);
}
.btn-primary:hover { box-shadow: var(--shadow-hover); transform: translateY(-1px); }
.btn-primary:active { transform: translateY(0); }
.btn-primary:disabled { opacity: 0.6; cursor: not-allowed; transform: none; }
.btn-outline {
    background: transparent;
    border: 1.5px solid var(--color-primary);
    color: var(--color-primary);
}
.btn-outline:hover { background: var(--color-bg-soft); }
.btn-block { width: 100%; }

/* ---- Cards / Forms ---- */
.card {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-card);
    padding: 32px;
}
.auth-wrapper {
    min-height: 80vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-bg-soft);
    padding: 40px 16px;
}
.auth-card { width: 100%; max-width: 420px; }
.auth-card h1 { font-size: 24px; margin: 0 0 6px; color: var(--color-primary); }
.auth-card p.subtitle { color: var(--color-text-muted); margin: 0 0 24px; font-size: 14px; }

.form-group { margin-bottom: 18px; }
.form-group label { display: block; font-size: 14px; font-weight: 600; margin-bottom: 6px; }
.form-control {
    width: 100%;
    padding: 12px 14px;
    border: 1.5px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: 15px;
    background: var(--color-bg);
    transition: border-color 0.2s, box-shadow 0.2s;
}
.form-control:focus {
    outline: none;
    border-color: var(--color-primary-light);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
}
.form-hint { font-size: 12px; color: var(--color-text-muted); margin-top: 4px; }
.form-error { font-size: 13px; color: var(--color-danger); margin-top: 4px; }

.auth-links { margin-top: 18px; font-size: 14px; text-align: center; color: var(--color-text-muted); }
.auth-links a { color: var(--color-primary); font-weight: 600; }

/* ---- Flash messages / Toasts ---- */
.alert {
    padding: 12px 16px;
    border-radius: var(--radius-md);
    font-size: 14px;
    margin-bottom: 16px;
}
.alert-success { background: #ecfdf5; color: var(--color-success); border: 1px solid #a7f3d0; }
.alert-error { background: #fef2f2; color: var(--color-danger); border: 1px solid #fecaca; }

/* ---- Header ---- */
.site-header {
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 50;
}
.site-header .brand { font-size: 20px; font-weight: 800; color: var(--color-primary); }

/* ---- Footer ---- */
.site-footer {
    background: var(--color-section);
    color: var(--color-text-muted);
    padding: 40px 0;
    margin-top: 60px;
    font-size: 14px;
}

@media (max-width: 640px) {
    .card { padding: 22px; }
}