/* ===================================================================
   Studibuch Widerruf — Styles
   =================================================================== */

:root {
    --color-primary: #95C11E;
    --color-primary-dark: #7BA019;
    --color-text: #2a2a2a;
    --color-text-muted: #6b6b6b;
    --color-border: #e0e0e0;
    --color-bg: #f7f7f7;
    --color-bg-card: #ffffff;
    --color-error: #d63838;
    --color-error-bg: #fdf1f1;

    --radius-sm: 4px;
    --radius-md: 8px;

    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.06);

    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
                 Helvetica, Arial, sans-serif;
}

* {
    box-sizing: border-box;
}

html, body {
    margin: 0;
    padding: 0;
}

body {
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.5;
    color: var(--color-text);
    background: var(--color-bg);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.container {
    width: 100%;
    max-width: 640px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ============== HEADER ============== */

.site-header {
    background: var(--color-bg-card);
    border-bottom: 1px solid var(--color-border);
    padding: 16px 0;
}

.site-logo {
    display: inline-flex;
    flex-direction: column;
    text-decoration: none;
    color: inherit;
}

.logo-mark {
    font-weight: 800;
    font-size: 20px;
    letter-spacing: 0.5px;
    color: var(--color-text);
}

.logo-tagline {
    font-size: 11px;
    color: var(--color-text-muted);
    letter-spacing: 1px;
    text-transform: uppercase;
    margin-top: 2px;
}

/* ============== MAIN / CARD ============== */

main {
    flex: 1;
    padding: 32px 0 48px;
}

.form-card {
    background: var(--color-bg-card);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    padding: 32px;
}

@media (max-width: 540px) {
    .form-card {
        padding: 24px 20px;
    }
}

h1 {
    margin: 0 0 12px;
    font-size: 28px;
    color: var(--color-text);
    font-weight: 700;
}

.intro {
    margin: 0 0 28px;
    color: var(--color-text-muted);
    font-size: 15px;
}

/* ============== FORM ============== */

.form-field {
    margin-bottom: 20px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

@media (max-width: 540px) {
    .form-row {
        grid-template-columns: 1fr;
        gap: 0;
    }
}

label {
    display: block;
    margin-bottom: 6px;
    font-weight: 600;
    font-size: 14px;
    color: var(--color-text);
}

.required {
    color: var(--color-error);
    font-weight: 400;
    margin-left: 2px;
}

.optional {
    color: var(--color-text-muted);
    font-weight: 400;
    font-size: 13px;
    margin-left: 4px;
}

input[type="text"],
input[type="email"],
textarea {
    width: 100%;
    padding: 10px 12px;
    font-family: inherit;
    font-size: 15px;
    color: var(--color-text);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

input[type="text"]:focus,
input[type="email"]:focus,
textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(149, 193, 30, 0.15);
}

textarea {
    resize: vertical;
    min-height: 80px;
}

.form-hint {
    display: block;
    margin-top: 4px;
    font-size: 13px;
    color: var(--color-text-muted);
    line-height: 1.4;
}

input[aria-invalid="true"],
textarea[aria-invalid="true"] {
    border-color: var(--color-error);
}

/* ============== CAPTCHA ============== */

.form-captcha {
    margin: 24px 0;
}

/* ============== ACTIONS ============== */

.form-actions {
    margin-top: 28px;
}

.btn-primary {
    display: block;
    width: 100%;
    padding: 14px 24px;
    font-family: inherit;
    font-size: 16px;
    font-weight: 600;
    color: #fff;
    background: var(--color-primary);
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: background-color 0.15s ease;
}

.btn-primary:hover,
.btn-primary:focus {
    background: var(--color-primary-dark);
    outline: none;
}

.btn-primary:disabled {
    background: var(--color-text-muted);
    cursor: not-allowed;
}

.form-disclaimer {
    margin: 16px 0 0;
    font-size: 13px;
    color: var(--color-text-muted);
    text-align: center;
    line-height: 1.4;
}

/* ============== MESSAGES ============== */

.form-message {
    margin-top: 20px;
    padding: 14px 16px;
    border-radius: var(--radius-sm);
    font-size: 14px;
}

.form-message-error {
    background: var(--color-error-bg);
    color: var(--color-error);
    border: 1px solid #f0c4c4;
}

.form-message strong {
    display: block;
    margin-bottom: 4px;
}

/* ============== FOOTER ============== */

.site-footer {
    padding: 24px 0;
    text-align: center;
    font-size: 13px;
    color: var(--color-text-muted);
    border-top: 1px solid var(--color-border);
    background: var(--color-bg-card);
}

.site-footer a {
    color: var(--color-text-muted);
    text-decoration: none;
    margin: 0 4px;
}

.site-footer a:hover {
    color: var(--color-primary);
}