/**
 * Netto-Brutto-Rechner 2026 - Base Styles
 * CSS Variables, Reset, Body, Typography
 */

/* ===== CSS Variables ===== */
:root {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --bg: #f8fafc;
    --text: #0f172a;
    --border: rgba(255, 255, 255, 0.4);
    --border-light: rgba(255, 255, 255, 0.6);
    --card-bg: rgba(255, 255, 255, 0.9);
    --input-bg: rgba(255, 255, 255, 0.85);
    --danger: #ef4444;
    --success: #10b981;
    --warning: #f59e0b;
    --warning-strong: #b45309;
    --muted: #475569;
    --table-stripe: rgba(255, 255, 255, 0.3);
    --radius: 24px;
    --shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.15);
    --glass-border: 1px solid rgba(255, 255, 255, 0.4);
    --tab-solid-bg: #f8fafc;
}

html.dark {
    --bg: #0f172a;
    --text: #f1f5f9;
    --border: rgba(255, 255, 255, 0.1);
    --border-light: rgba(255, 255, 255, 0.2);
    --card-bg: rgba(15, 23, 42, 0.85);
    --input-bg: rgba(30, 41, 59, 0.75);
    --muted: #cbd5e1;
    --warning-strong: #fbbf24;
    --table-stripe: rgba(255, 255, 255, 0.05);
    --shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.3);
    --glass-border: 1px solid rgba(255, 255, 255, 0.1);
    --tab-solid-bg: #1e293b;
}

/* ===== CSS Reset ===== */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html,
body {
    height: 100%;
}

/* ===== Body ===== */
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: var(--bg);
    /* Dark mode vibrant gradients */
    background-image:
        radial-gradient(at 0% 0%, hsla(253, 16%, 7%, 1) 0, transparent 50%),
        radial-gradient(at 50% 0%, hsla(260, 50%, 30%, 0.8) 0, transparent 50%),
        radial-gradient(at 100% 0%, hsla(340, 60%, 30%, 0.8) 0, transparent 50%),
        radial-gradient(at 0% 100%, hsla(220, 50%, 20%, 0.5) 0, transparent 50%);
    background-attachment: fixed;
    background-size: cover;
    color: var(--text);
    line-height: 1.6;
    transition: color 0.5s ease;
    min-height: 100vh;
}

/* Light mode vibrant gradients */
html:not(.dark) body {
    background-image:
        radial-gradient(at 10% 10%, rgba(99, 102, 241, 0.4) 0, transparent 50%),
        radial-gradient(at 90% 10%, rgba(236, 72, 153, 0.3) 0, transparent 50%),
        radial-gradient(at 50% 90%, rgba(14, 165, 233, 0.3) 0, transparent 50%);
}

/* ===== Container ===== */
.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 1rem;
}

.container-narrow {
    max-width: 800px;
    margin: 0 auto;
    padding: 2rem 1rem;
}

/* ===== Typography ===== */
h1 {
    font-size: 2.5rem;
    font-weight: 800;
    letter-spacing: -0.025em;
    margin-bottom: 0.5rem;
    background: linear-gradient(to right, var(--primary), #ec4899);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

h2 {
    font-size: 1.5rem;
    margin: 2rem 0 1rem;
    color: var(--primary);
}

h2:first-child {
    margin-top: 0;
}

h3 {
    font-size: 1.2rem;
    margin: 1.5rem 0 0.75rem;
    color: var(--text);
}

p {
    margin-bottom: 1rem;
    color: var(--muted);
}

strong {
    color: var(--text);
}

.subtitle {
    color: var(--muted);
    font-size: 1.1rem;
    font-weight: 400;
}

/* ===== Links ===== */
a {
    color: var(--primary);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

footer a {
    color: var(--text);
    text-decoration: underline;
}

html.dark footer a {
    color: var(--primary-light);
}

/* ===== Header ===== */
header {
    text-align: center;
    margin-bottom: 3rem;
    padding-top: 1rem;
    position: relative;
}

/* ===== Lists ===== */
ul,
ol {
    margin: 0.5rem 0 1rem 1.5rem;
    color: var(--muted);
}

li {
    margin-bottom: 0.4rem;
}

/* ===== Utility Classes ===== */
[x-cloak] {
    display: none !important;
}

/* ===== Custom Scrollbar ===== */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg);
}

::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 10px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--muted);
}

/* ===== Responsive ===== */
@media (max-width: 640px) {
    h1 {
        font-size: 1.8rem;
    }

    h2 {
        font-size: 1.3rem;
    }

    .container {
        padding: 0.75rem;
    }
}

/* ===== Accessibility: Focus States ===== */
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible,
a:focus-visible,
[tabindex]:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

/* Remove default focus for mouse users while keeping for keyboard */
button:focus:not(:focus-visible),
input:focus:not(:focus-visible),
select:focus:not(:focus-visible),
a:focus:not(:focus-visible) {
    outline: none;
}

/* ===== Accessible Field Help Text ===== */
.field-help {
    display: block;
    font-size: 0.75rem;
    color: var(--muted);
    margin-top: 0.4rem;
    line-height: 1.4;
    opacity: 0.85;
}