/* === RESET & BASE === */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --gold: #D4AF37;
    --gold-light: #F5E6A3;
    --gold-dark: #B8960C;
    --black: #1a1a1a;
    --gray: #666;
    --gray-light: #f5f5f5;
    --gray-border: #e0e0e0;
    --white: #ffffff;
    --green: #2e7d32;
    --red: #c62828;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--gray-light);
    color: var(--black);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: 640px;
    margin: 0 auto;
    padding: 20px 16px;
}

/* === HEADER === */
header {
    text-align: center;
    margin-bottom: 24px;
}

.logo {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
}

.logo-main {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--black);
    letter-spacing: -0.02em;
}

.logo-sub {
    font-size: 0.8125rem;
    color: var(--gold-dark);
    font-weight: 500;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

/* === TABS METAUX === */
.metal-tabs {
    position: relative;
    margin-bottom: 20px;
}

.hamburger {
    display: none;
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--gold);
    border-radius: 8px;
    background: var(--white);
    color: var(--gold-dark);
    font-size: 0.9375rem;
    font-weight: 600;
    cursor: pointer;
    align-items: center;
    justify-content: space-between;
}

.hamburger-icon {
    font-size: 0.75rem;
    transition: transform 0.2s;
}

.hamburger.open .hamburger-icon {
    transform: rotate(180deg);
}

.tabs-list {
    display: flex;
    gap: 6px;
}

.tab {
    flex: 1;
    min-width: 0;
    padding: 10px 8px;
    border: 2px solid var(--gray-border);
    border-radius: 8px;
    background: var(--white);
    color: var(--gray);
    font-size: 0.8125rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    white-space: nowrap;
}

.tab:hover {
    border-color: var(--gold);
    color: var(--gold-dark);
}

.tab.active {
    background: var(--gold);
    border-color: var(--gold);
    color: var(--white);
}

/* === PRIX SPOT === */
.spot-price {
    background: var(--white);
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 20px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.08);
}

.spot-price h2 {
    font-size: 1.125rem;
    font-weight: 700;
    margin-bottom: 14px;
    color: var(--black);
}

.spot-table {
    width: 100%;
    border-collapse: collapse;
}

.spot-table th {
    text-align: right;
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--gray);
    padding: 8px 0;
    border-bottom: 2px solid var(--gray-border);
}

.spot-table th:first-child {
    text-align: left;
}

.spot-label {
    font-size: 0.9375rem;
    color: var(--gray);
    padding: 12px 0;
}

.spot-val {
    text-align: right;
    font-size: 1.0625rem;
    font-weight: 700;
    font-variant-numeric: tabular-nums;
    padding: 12px 0;
    color: var(--black);
}

.spot-table tbody tr {
    border-bottom: 1px solid var(--gray-light);
}

.spot-table tbody tr:last-child {
    border-bottom: none;
}

.price-update {
    margin-top: 12px;
    font-size: 0.75rem;
    color: var(--gray);
    text-align: center;
}

/* === TABLEAU ALLIAGES === */
.alloys-section {
    background: var(--white);
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 20px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.08);
}

.alloys-section h2 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--black);
}

.alloys-table {
    width: 100%;
    border-collapse: collapse;
}

.alloys-table th {
    text-align: left;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--gray);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 8px 0;
    border-bottom: 2px solid var(--gray-border);
}

.alloys-table th:not(:first-child) {
    text-align: right;
}

.alloys-table td {
    padding: 10px 0;
    font-size: 0.9375rem;
    border-bottom: 1px solid var(--gray-light);
}

.alloys-table td:not(:first-child) {
    text-align: right;
    font-weight: 600;
    font-variant-numeric: tabular-nums;
}

.alloys-table td:first-child {
    color: var(--gray);
}

.alloys-table tr:last-child td {
    border-bottom: none;
}

/* === CALCULATRICE === */
.calculator {
    background: var(--white);
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 20px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.08);
}

.calculator h2 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--black);
}

.calc-row {
    display: flex;
    gap: 12px;
    margin-bottom: 12px;
}

.calc-field {
    flex: 1;
}

.calc-field-full {
    max-width: 50%;
}

.calc-field label {
    display: block;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--gray);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 6px;
}

.calc-field select,
.calc-field input {
    width: 100%;
    padding: 10px 12px;
    border: 2px solid var(--gray-border);
    border-radius: 8px;
    font-size: 0.9375rem;
    color: var(--black);
    background: var(--white);
    transition: border-color 0.2s;
    -webkit-appearance: none;
}

.calc-field select:focus,
.calc-field input:focus {
    outline: none;
    border-color: var(--gold);
}

.btn-calc {
    width: 100%;
    padding: 12px;
    background: var(--gold);
    color: var(--white);
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s;
    margin-top: 4px;
}

.btn-calc:hover {
    background: var(--gold-dark);
}

.btn-calc:active {
    transform: scale(0.98);
}

.calc-result {
    margin-top: 16px;
    padding: 16px;
    background: var(--gray-light);
    border-radius: 8px;
    display: flex;
    justify-content: center;
    border: 2px solid var(--gold-light);
}

.calc-table {
    border-collapse: collapse;
    font-variant-numeric: tabular-nums;
}

.calc-td-label {
    text-align: right;
    padding: 2px 8px 2px 0;
    font-size: 0.9375rem;
    color: var(--gray);
    white-space: nowrap;
    width: 1%;
}

.calc-td-amount {
    text-align: right;
    padding: 2px 4px;
    font-size: 0.9375rem;
    color: var(--gray);
}

.calc-td-cur {
    text-align: left;
    padding: 2px 0 2px 4px;
    font-size: 0.9375rem;
    color: var(--gray);
    white-space: nowrap;
    width: 1%;
}

.calc-td-red {
    color: var(--red);
}

.calc-row-decote td {
    padding-bottom: 8px;
    border-bottom: 1px solid var(--gray-border);
}

.calc-row-net td {
    padding-top: 10px;
}

.calc-td-net {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--gold-dark);
}

.calc-td-net-label {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--gold-dark);
    vertical-align: baseline;
}

.calc-td-eur {
    font-size: 1rem;
    color: var(--gray);
}

.calc-row-eur .calc-td-amount {
    font-size: 1rem;
}

/* === FOOTER === */
footer {
    text-align: center;
    padding: 20px 0 10px;
}

footer p {
    font-size: 0.8125rem;
    color: var(--gray);
}

.footer-source {
    margin-top: 4px;
    font-size: 0.6875rem;
    color: #999;
}

/* === LOADING STATE === */
.loading .price-value {
    color: var(--gray);
}

/* === RESPONSIVE === */
@media (max-width: 540px) {
    .container {
        padding: 16px 12px;
    }

    .logo-main {
        font-size: 1.15rem;
    }

    .logo-sub {
        font-size: 0.6875rem;
    }

    .hamburger {
        display: flex;
    }

    .tabs-list {
        display: none;
        flex-direction: column;
        gap: 4px;
        position: absolute;
        top: calc(100% + 4px);
        left: 0;
        right: 0;
        background: var(--white);
        border: 2px solid var(--gray-border);
        border-radius: 8px;
        padding: 6px;
        box-shadow: 0 4px 12px rgba(0,0,0,0.12);
        z-index: 100;
    }

    .tabs-list.open {
        display: flex;
    }

    .tabs-list .tab {
        flex: none;
        text-align: left;
        padding: 12px 14px;
        border-radius: 6px;
        font-size: 0.9375rem;
    }

    .spot-table th,
    .spot-val {
        font-size: 0.875rem;
    }

    .calc-row {
        flex-direction: column;
        gap: 8px;
    }

    .calc-td-net {
        font-size: 1.5rem;
    }
}