/* Light theme (default) */
:root,
[data-theme="light"] {
    --bg-page: #f5f7fa;
    --bg-card: #ffffff;
    --bg-card-hover: rgba(0,0,0,0.02);
    --bg-nav: linear-gradient(135deg, #1e3a5f 0%, #2d5a87 100%);
    --bg-input: #ffffff;
    --text: #1e3a5f;
    --text-primary: #1e3a5f;
    --text-secondary: #334155;
    --text-muted: #64748b;
    --text-nav: rgba(255,255,255,0.9);
    --border-color: #e2e8f0;
    --accent: #2d5a87;
    --accent-start: #1e3a5f;
    --accent-end: #2d5a87;
    --accent-hover: rgba(30, 58, 95, 0.35);
    --shadow-sm: 0 2px 12px rgba(0,0,0,0.06);
    --shadow-md: 0 4px 24px rgba(30, 58, 95, 0.08);
    --shadow-lg: 0 8px 24px rgba(30, 58, 95, 0.12);
    --input-focus: rgba(45, 90, 135, 0.15);
    --input-placeholder: #94a3b8;
    --alert-danger-bg: #fef2f2;
    --alert-danger-border: #fecaca;
    --alert-danger-text: #b91c1c;
    --alert-warning-bg: #fffbeb;
    --alert-warning-border: #fcd34d;
    --alert-warning-text: #b45309;
    --alert-warning-accent: #d97706;
    --alert-success-bg: #dcfce7;
    --alert-success-border: #bbf7d0;
    --alert-success-text: #166534;
}

:root body,
[data-theme="light"] body {
    color: var(--text-primary);
}

/* Dark theme */
[data-theme="dark"] {
    --bg-page: #0f172a;
    --bg-card: #1e293b;
    --bg-card-hover: rgba(255,255,255,0.05);
    --bg-nav: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
    --bg-input: #334155;
    --text: #f1f5f9;
    --text-primary: #f1f5f9;
    --text-secondary: #e2e8f0;
    --text-muted: #94a3b8;
    --text-nav: rgba(255,255,255,0.9);
    --border-color: #475569;
    --accent: #38bdf8;
    --accent-start: #0ea5e9;
    --accent-end: #38bdf8;
    --accent-hover: rgba(56, 189, 248, 0.25);
    --shadow-sm: 0 2px 12px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 24px rgba(0,0,0,0.4);
    --shadow-lg: 0 8px 24px rgba(0,0,0,0.5);
    --input-focus: rgba(56, 189, 248, 0.25);
    --input-placeholder: #cbd5e1;
    --alert-danger-bg: #450a0a;
    --alert-danger-border: #7f1d1d;
    --alert-danger-text: #fca5a5;
    --alert-warning-bg: #422006;
    --alert-warning-border: #b45309;
    --alert-warning-text: #fcd34d;
    --alert-warning-accent: #fbbf24;
    --alert-success-bg: #14532d;
    --alert-success-border: #166534;
    --alert-success-text: #86efac;
}

[data-theme="dark"] body,
[data-theme="dark"] .main-content {
    color: var(--text-primary);
}

/* Placeholder visibility (light and dark) */
input::placeholder,
textarea::placeholder {
    color: var(--input-placeholder);
    opacity: 1;
}