:root {
    --bg: #ffffff;
    --surface: #f7f7f8;
    --border: #e4e4e7;
    --text: #18181b;
    --text-muted: #71717a;
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --danger: #dc2626;
    --success: #16a34a;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
    --radius: 10px;
}

[data-theme="dark"] {
    --bg: #0b0b0d;
    --surface: #161618;
    --border: #2a2a2e;
    --text: #f4f4f5;
    --text-muted: #a1a1aa;
    --primary: #60a5fa;
    --primary-hover: #93c5fd;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.4);
}

* { box-sizing: border-box; }

html, body {
    margin: 0;
    padding: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, "Vazirmatn", "Iran Sans", Tahoma, sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    transition: background 0.2s, color 0.2s;
}

[dir="rtl"] body { font-family: "Vazirmatn", "Iran Sans", Tahoma, system-ui, sans-serif; }

.topbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 14px 24px;
    border-bottom: 1px solid var(--border);
    background: var(--surface);
}

.brand {
    font-weight: 700;
    font-size: 18px;
    color: var(--text);
    text-decoration: none;
}

.topbar-actions {
    display: flex;
    gap: 8px;
    align-items: center;
}

.icon-btn {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text);
    padding: 6px 12px;
    border-radius: var(--radius);
    cursor: pointer;
    font-size: 13px;
    font-weight: 500;
    transition: background 0.15s;
}
.icon-btn:hover { background: var(--surface); border-color: var(--text-muted); }

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 32px 24px;
}

.hero {
    text-align: center;
    padding: 64px 24px;
}
.hero h1 { font-size: 36px; margin: 0 0 12px; }
.hero p { color: var(--text-muted); font-size: 16px; margin: 0 0 24px; }

.cta {
    display: inline-flex;
    gap: 12px;
}

.btn {
    display: inline-block;
    padding: 10px 20px;
    border-radius: var(--radius);
    font-weight: 600;
    font-size: 14px;
    text-decoration: none;
    cursor: pointer;
    border: 1px solid transparent;
    transition: background 0.15s, transform 0.05s;
}
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-hover); }
.btn-ghost { background: transparent; color: var(--text); border-color: var(--border); }
.btn-ghost:hover { background: var(--surface); }

.auth-card {
    max-width: 400px;
    margin: 64px auto;
    padding: 32px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}
.auth-card h2 { margin: 0 0 20px; }

.field { margin-bottom: 14px; }
.field label {
    display: block;
    font-size: 13px;
    margin-bottom: 6px;
    color: var(--text-muted);
}
.field input {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--bg);
    color: var(--text);
    font-size: 14px;
    font-family: inherit;
}
.field input:focus {
    outline: none;
    border-color: var(--primary);
}

.password-wrap { position: relative; }
.password-wrap input { padding-inline-start: 40px; }
.pw-toggle {
    position: absolute;
    inset-block-start: 50%;
    inset-inline-start: 10px;
    transform: translateY(-50%);
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
    color: var(--text-muted);
    line-height: 0;
    border-radius: 4px;
}
.pw-toggle:hover { color: var(--text); }

.form-actions { margin-top: 20px; }
.form-actions .btn { width: 100%; }

.form-foot {
    margin-top: 16px;
    text-align: center;
    font-size: 13px;
    color: var(--text-muted);
}
.form-foot a { color: var(--primary); text-decoration: none; }

.alert {
    padding: 10px 12px;
    border-radius: 8px;
    margin-bottom: 14px;
    font-size: 13px;
    display: none;
}
.alert.error { background: rgba(220, 38, 38, 0.1); color: var(--danger); }
.alert.error:not(:empty) { display: block; }
.alert.success { background: rgba(22, 163, 74, 0.1); color: var(--success); }
.alert.success:not(:empty) { display: block; }

.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 16px;
    margin-top: 48px;
}
.feature {
    padding: 20px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
}
.feature h3 { margin: 0 0 8px; font-size: 16px; }
.feature p { margin: 0; color: var(--text-muted); font-size: 14px; }