/* ============================================================
   Kite Size Optimizer — Moerzinger.eu Branding
   www.moerzinger.eu
   Dark theme inspired by LakeUnited CD
   ============================================================ */

:root {
    --lu-primary: #ffffff;
    --lu-primary-light: #e0e0e0;
    --lu-accent: #E8734A;
    --lu-accent-light: #F09070;
    --lu-accent-dark: #D45A30;
    --lu-bg: #0f0f0f;
    --lu-card: #1a1a1a;
    --lu-card-elevated: #222222;
    --lu-text: #f0f0f0;
    --lu-text-muted: #9a9a9a;
    --lu-border: #2e2e2e;
    --lu-success: #4ade80;
    --lu-radius: 12px;
    --lu-shadow: 0 1px 3px rgba(0, 0, 0, 0.3), 0 4px 12px rgba(0, 0, 0, 0.2);
    --lu-shadow-lg: 0 4px 6px rgba(0, 0, 0, 0.3), 0 10px 30px rgba(0, 0, 0, 0.3);
}

*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--lu-bg);
    color: var(--lu-text);
    line-height: 1.6;
    min-height: 100vh;
}

/* ---- HEADER ---- */
.header {
    background: linear-gradient(135deg, #111111 0%, #1a1a1a 50%, #222222 100%);
    color: white;
    padding: 0;
    position: relative;
    overflow: hidden;
    border-bottom: 3px solid var(--lu-accent);
}

.header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.02'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    opacity: 0.5;
}

.header-inner {
    max-width: 960px;
    margin: 0 auto;
    padding: 28px 24px 32px;
    position: relative;
    z-index: 1;
}

.header-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 8px;
    font-size: 13px;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    opacity: 0.85;
}

.header-brand span {
    color: var(--lu-accent);
}

.header-brand a {
    color: var(--lu-accent);
    text-decoration: none;
    opacity: 0.9;
}

.header-brand a:hover {
    opacity: 1;
    text-decoration: underline;
}

.header h1 {
    font-size: 2rem;
    font-weight: 700;
    letter-spacing: -0.5px;
    line-height: 1.2;
    color: #ffffff;
}

.header p {
    margin-top: 8px;
    font-size: 1.05rem;
    opacity: 0.7;
    max-width: 600px;
    color: #cccccc;
}

.beta-badge {
    display: inline-block;
    margin-top: 10px;
    padding: 4px 14px;
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 0.03em;
    color: var(--lu-accent);
    border: 1px solid var(--lu-accent);
    border-radius: 999px;
    opacity: 0.9;
}

/* ---- MAIN CONTENT ---- */
.main {
    max-width: 960px;
    margin: 0 auto;
    padding: 24px;
}

/* ---- CARD ---- */
.card {
    background: var(--lu-card);
    border-radius: var(--lu-radius);
    box-shadow: var(--lu-shadow);
    padding: 28px;
    margin-bottom: 24px;
    border: 1px solid var(--lu-border);
}

.card-title {
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--lu-accent);
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 8px;
}

/* ---- FORM ---- */
.form-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.form-group.full-width {
    grid-column: 1 / -1;
}

.form-group label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--lu-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.form-group select,
.form-group input[type="number"] {
    padding: 10px 14px;
    border: 1.5px solid var(--lu-border);
    border-radius: 8px;
    font-size: 0.95rem;
    color: var(--lu-text);
    background: var(--lu-card-elevated);
    transition: border-color 0.2s, box-shadow 0.2s;
    appearance: auto;
}

.form-group select:focus,
.form-group input:focus {
    outline: none;
    border-color: var(--lu-accent);
    box-shadow: 0 0 0 3px rgba(232, 115, 74, 0.2);
}

/* Range slider */
.slider-container {
    display: flex;
    align-items: center;
    gap: 12px;
}

.slider-container input[type="range"] {
    flex: 1;
    height: 6px;
    -webkit-appearance: none;
    appearance: none;
    background: var(--lu-border);
    border-radius: 3px;
    outline: none;
}

.slider-container input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: var(--lu-accent);
    cursor: pointer;
    border: 3px solid var(--lu-card);
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.4);
    transition: transform 0.15s;
}

.slider-container input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.15);
}

.slider-container input[type="range"]::-moz-range-thumb {
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: var(--lu-accent);
    cursor: pointer;
    border: 3px solid var(--lu-card);
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.4);
}

.slider-value {
    min-width: 50px;
    text-align: right;
    font-weight: 600;
    font-size: 1.05rem;
    color: var(--lu-accent);
}

.spot-description {
    font-size: 0.88rem;
    color: var(--lu-text-muted);
    margin-top: 2px;
    line-height: 1.5;
}

/* ---- BUTTON ---- */
.btn-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    background: var(--lu-accent);
    color: white;
    border: none;
    padding: 14px 32px;
    font-size: 1.05rem;
    font-weight: 600;
    border-radius: 10px;
    cursor: pointer;
    transition: transform 0.15s, box-shadow 0.15s, background 0.15s;
    box-shadow: 0 2px 8px rgba(232, 115, 74, 0.3);
    width: 100%;
    margin-top: 8px;
}

.btn-primary:hover {
    transform: translateY(-1px);
    background: var(--lu-accent-dark);
    box-shadow: 0 4px 16px rgba(232, 115, 74, 0.4);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-primary:disabled {
    opacity: 0.6;
    cursor: wait;
}

/* ---- RESULTS ---- */
.hidden {
    display: none !important;
}

.results-header {
    text-align: center;
    margin-bottom: 24px;
}

.results-header h2 {
    font-size: 1.4rem;
    color: #ffffff;
}

.results-header .spot-name {
    color: var(--lu-text-muted);
    font-size: 0.95rem;
    margin-top: 4px;
}

/* Stats row */
.stats-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-bottom: 24px;
}

.stat-box {
    text-align: center;
    padding: 20px 16px;
    background: rgba(232, 115, 74, 0.08);
    border-radius: 10px;
    border: 1px solid rgba(232, 115, 74, 0.2);
}

.stat-value {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--lu-accent);
    line-height: 1;
}

.stat-label {
    font-size: 0.82rem;
    color: var(--lu-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-top: 6px;
}

/* Kite cards */
.kite-cards {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    justify-content: center;
    margin-bottom: 28px;
}

.kite-card {
    border: 2.5px solid var(--lu-accent);
    border-radius: 12px;
    padding: 20px 24px;
    text-align: center;
    min-width: 120px;
    background: rgba(232, 115, 74, 0.05);
    transition: transform 0.2s, box-shadow 0.2s;
}

.kite-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 4px 20px rgba(232, 115, 74, 0.2);
}

.kite-size-number {
    font-size: 2.2rem;
    font-weight: 700;
    color: #ffffff;
    line-height: 1;
}

.kite-unit {
    font-size: 1rem;
    font-weight: 400;
    color: var(--lu-text-muted);
}

.kite-wind-range {
    font-size: 0.85rem;
    color: var(--lu-text-muted);
    margin-top: 6px;
}

.range-icon {
    font-style: normal;
}

/* Charts */
.chart-container {
    position: relative;
    height: 340px;
    margin: 20px 0;
}

.chart-container.monthly {
    height: 260px;
}

/* Monthly table */
.monthly-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
    margin-top: 16px;
}

.monthly-table th,
.monthly-table td {
    padding: 8px 12px;
    border-bottom: 1px solid var(--lu-border);
}

.monthly-table th {
    text-align: left;
    font-weight: 600;
    color: var(--lu-text-muted);
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.4px;
}

.monthly-table td.text-right,
.monthly-table th.text-right {
    text-align: right;
}

.monthly-table tbody tr:hover {
    background: rgba(232, 115, 74, 0.06);
}

.monthly-table tfoot td {
    border-bottom: none;
    border-top: 2px solid var(--lu-border);
    padding-top: 10px;
}

/* Mini bar in table */
.mini-bar {
    height: 8px;
    background: var(--lu-border);
    border-radius: 4px;
    overflow: hidden;
    min-width: 80px;
}

.mini-bar-fill {
    height: 100%;
    background: var(--lu-accent);
    border-radius: 4px;
    transition: width 0.4s ease;
}

/* ---- CALIBRATION FEEDBACK ---- */
.calibration-question {
    font-size: 1.05rem;
    margin-bottom: 16px;
    line-height: 1.5;
}

.calibration-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.btn-feedback {
    padding: 10px 18px;
    border-radius: 8px;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    border: 1.5px solid var(--lu-border);
    background: var(--lu-card-elevated);
    color: var(--lu-text);
    transition: border-color 0.2s, background 0.2s;
}

.btn-feedback:hover:not(:disabled) {
    border-color: var(--lu-accent);
    background: rgba(232, 115, 74, 0.1);
}

.btn-feedback:disabled {
    opacity: 0.4;
    cursor: default;
}

.btn-feedback.btn-yes { border-color: #4ade80; color: #4ade80; }
.btn-feedback.btn-yes:hover:not(:disabled) { background: rgba(74, 222, 128, 0.12); border-color: #4ade80; }

.btn-feedback.btn-no { border-color: #f87171; color: #f87171; }
.btn-feedback.btn-no:hover:not(:disabled) { background: rgba(248, 113, 113, 0.12); border-color: #f87171; }

.btn-feedback.btn-small { border-color: #fbbf24; color: #fbbf24; }
.btn-feedback.btn-small:hover:not(:disabled) { background: rgba(251, 191, 36, 0.12); border-color: #fbbf24; }

.btn-feedback.btn-skip { border-color: var(--lu-border); color: var(--lu-text-muted); }

.calibration-thanks {
    margin-top: 14px;
    font-size: 0.95rem;
    color: #4ade80;
    font-weight: 600;
}

/* ---- FOOTER ---- */
.footer {
    text-align: center;
    padding: 32px 24px;
    color: var(--lu-text-muted);
    font-size: 0.82rem;
    border-top: 1px solid var(--lu-border);
}

.footer a {
    color: var(--lu-accent);
    text-decoration: none;
}

.footer a:hover {
    text-decoration: underline;
}

.footer .disclaimer {
    max-width: 600px;
    margin: 0 auto 12px;
    line-height: 1.5;
}

/* ---- RESPONSIVE ---- */
@media (max-width: 640px) {
    .header h1 {
        font-size: 1.5rem;
    }

    .header-inner {
        padding: 20px 16px 24px;
    }

    .main {
        padding: 16px;
    }

    .card {
        padding: 20px 16px;
    }

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

    .stats-row {
        grid-template-columns: 1fr 1fr;
    }

    .stat-value {
        font-size: 2rem;
    }

    .kite-cards {
        gap: 8px;
    }

    .kite-card {
        padding: 14px 16px;
        min-width: 100px;
    }

    .kite-size-number {
        font-size: 1.8rem;
    }

    .chart-container {
        height: 280px;
    }

    .chart-container.monthly {
        height: 220px;
    }

    .monthly-table {
        font-size: 0.82rem;
    }

    .monthly-table th,
    .monthly-table td {
        padding: 6px 8px;
    }
}