/* ═══════════════════════════════════════════════
   Converter Tool — Warm Amber Theme
   ═══════════════════════════════════════════════ */

.converter-container {
    display: flex;
    flex-direction: column;
    gap: 1.75rem;
    margin-top: 2rem;
}

/* ─── Card ─── */
.converter-card {
    background: var(--bg-surface);
    border: 1px solid var(--border-strong);
    border-radius: var(--radius-xl);
    padding: 2.25rem;
    box-shadow: var(--shadow-card);
    position: relative;
    overflow: hidden;
}

.converter-card::before {
    content: '';
    position: absolute;
    top: -80%;
    left: 20%;
    width: 60%;
    height: 160%;
    background: radial-gradient(ellipse, rgba(245, 158, 11, .04) 0%, transparent 70%);
    pointer-events: none;
    z-index: 0;
}

.converter-card>* {
    position: relative;
    z-index: 1;
}

/* ─── Inputs ─── */
.input-row {
    display: flex;
    align-items: flex-end;
    gap: 1rem;
}

.field {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: .4rem;
}

.field-label {
    font-size: .68rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: .08em;
    color: var(--text-muted);
}

.field-input,
.field-select {
    padding: .8rem .9rem;
    background: var(--bg-input);
    border: 1.5px solid var(--border-strong);
    border-radius: var(--radius);
    font-family: 'IBM Plex Mono', monospace;
    font-size: 1rem;
    color: var(--text-primary);
    transition: border var(--transition), box-shadow var(--transition);
    width: 100%;
}

.field-input:focus,
.field-select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-ring);
}

.field-input[type="number"]::-webkit-outer-spin-button,
.field-input[type="number"]::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

.field-input[type="number"] {
    -moz-appearance: textfield;
}

.swap-btn {
    flex-shrink: 0;
    width: 2.5rem;
    height: 2.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-elevated);
    border: 1.5px solid var(--border-strong);
    border-radius: 50%;
    color: var(--primary);
    font-size: .95rem;
    transition: all .25s;
    margin-bottom: 2px;
}

.swap-btn:hover {
    background: var(--primary);
    color: #fff;
    border-color: var(--primary);
    transform: rotate(180deg);
}

@media (max-width:640px) {
    .input-row {
        flex-direction: column;
        align-items: stretch;
    }

    .swap-btn {
        width: 100%;
        border-radius: var(--radius);
        height: 2.5rem;
    }

    .swap-btn:hover {
        transform: none;
    }

    .swap-btn i {
        transform: rotate(90deg);
    }
}

/* ─── Result ─── */
.result-section {
    margin-top: 2rem;
    text-align: center;
    padding: 2.5rem 1.5rem;
    background: var(--gradient-subtle);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    position: relative;
}

.result-section::after {
    content: '';
    position: absolute;
    inset: 0;
    background-image: radial-gradient(var(--border-strong) 1px, transparent 1px);
    background-size: 18px 18px;
    opacity: .25;
    pointer-events: none;
    border-radius: inherit;
}

.result-section>* {
    position: relative;
    z-index: 1;
}

.result-label {
    display: inline-block;
    font-size: .65rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: .12em;
    color: var(--text-muted);
    margin-bottom: .75rem;
    background: var(--bg-input);
    padding: .25rem .7rem;
    border-radius: 50px;
    border: 1px solid var(--border);
}

.result-value {
    font-size: 3.25rem;
    font-weight: 800;
    line-height: 1.1;
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    word-break: break-all;
}

.result-unit {
    font-size: 1.05rem;
    color: var(--text-secondary);
    font-weight: 500;
    margin-top: .35rem;
}

.formula-display {
    margin-top: 1.25rem;
    font-family: 'IBM Plex Mono', monospace;
    font-size: .8rem;
    color: var(--text-muted);
    background: var(--bg-input);
    padding: .4rem .9rem;
    border-radius: 50px;
    display: inline-block;
    border: 1px solid var(--border);
}

/* ─── Reference Table ─── */
.ref-card {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    overflow: hidden;
}

.ref-card-header {
    padding: 1.1rem 1.35rem;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    gap: .5rem;
}

.ref-card-header i {
    color: var(--primary);
    font-size: .85rem;
}

.ref-card-header h3 {
    font-size: .9rem;
    color: var(--text-secondary);
}

.ref-table-wrapper {
    overflow-x: auto;
}

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

.ref-table th {
    text-align: left;
    padding: .75rem 1.15rem;
    font-size: .68rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: .07em;
    color: var(--primary);
    background: var(--bg-input);
    border-bottom: 1px solid var(--border);
    white-space: nowrap;
}

.ref-table td {
    padding: .75rem 1.15rem;
    border-bottom: 1px solid var(--border);
    color: var(--text-secondary);
    font-family: 'IBM Plex Mono', monospace;
    font-size: .82rem;
}

.ref-table tbody tr {
    transition: background var(--transition);
}

.ref-table tbody tr:hover td {
    background: var(--primary-soft);
}

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

/* ═══════════════════════════════════════════════
   New Features — Copy, History, Convert-All, etc.
   ═══════════════════════════════════════════════ */

/* ─ Toast Notification ─ */
#toast {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%) translateY(20px);
    background: var(--bg-elevated);
    color: var(--text-primary);
    border: 1px solid var(--border-glow);
    padding: .6rem 1.25rem;
    border-radius: 50px;
    font-size: .82rem;
    font-weight: 600;
    opacity: 0;
    pointer-events: none;
    transition: all .3s var(--ease);
    z-index: 1000;
    box-shadow: 0 4px 20px rgba(0, 0, 0, .3);
}

#toast.show {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

/* ─ Action Bar (Copy + Convert All) ─ */
.action-bar {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: .5rem;
    margin-top: 1rem;
    position: relative;
    z-index: 1;
}

.action-btn {
    display: inline-flex;
    align-items: center;
    gap: .4rem;
    padding: .45rem .85rem;
    background: var(--primary-soft);
    border: 1px solid var(--border-glow);
    border-radius: 50px;
    color: var(--text-secondary);
    font-size: .7rem;
    font-weight: 600;
    transition: all .25s;
    cursor: pointer;
}

.action-btn:hover {
    color: var(--primary);
    background: rgba(245, 158, 11, .12);
    border-color: var(--primary);
    transform: translateY(-1px);
}

.action-btn.active {
    color: var(--primary);
    background: var(--primary-soft);
    border-color: var(--border-glow);
}

.action-btn .kbd {
    font-size: .6rem;
    padding: .1rem .3rem;
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: 3px;
    color: var(--text-muted);
    font-family: 'IBM Plex Mono', monospace;
    margin-left: .2rem;
}

/* ─ Convert All Grid ─ */
.convert-all-grid {
    display: none;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: .6rem;
    margin-top: 1rem;
    position: relative;
    z-index: 1;
}

.convert-all-grid.active {
    display: grid;
}

.convert-all-item {
    padding: .75rem;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    text-align: center;
}

.convert-all-value {
    display: block;
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-primary);
    font-family: 'IBM Plex Mono', monospace;
}

.convert-all-unit {
    display: block;
    font-size: .7rem;
    color: var(--text-muted);
    margin-top: .2rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: .05em;
}

/* ─ History Panel ─ */
.history-card {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    overflow: hidden;
}

.history-header {
    padding: 1rem 1.25rem;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    gap: .5rem;
}

.history-header i {
    color: var(--primary);
    font-size: .85rem;
}

.history-header h3 {
    font-size: .9rem;
    color: var(--text-secondary);
}

#historyPanel {
    padding: .5rem;
    max-height: 240px;
    overflow-y: auto;
}

.history-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    padding: .55rem .75rem;
    background: none;
    border: none;
    border-radius: var(--radius);
    color: var(--text-secondary);
    font-size: .8rem;
    cursor: pointer;
    transition: background .15s;
    font-family: 'IBM Plex Mono', monospace;
    text-align: left;
}

.history-item:hover {
    background: var(--primary-soft);
    color: var(--text-primary);
}

.history-text {
    flex: 1;
}

.history-time {
    font-size: .65rem;
    color: var(--text-muted);
    white-space: nowrap;
    margin-left: .5rem;
}

.history-empty {
    text-align: center;
    color: var(--text-muted);
    font-size: .82rem;
    padding: 1.5rem;
}

/* ─ Favorites Button ─ */
.fav-btn {
    position: absolute;
    top: 1rem;
    right: 1rem;
    width: 2rem;
    height: 2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: .9rem;
    cursor: pointer;
    transition: all .2s;
    z-index: 5;
    border-radius: 50%;
}

.fav-btn:hover {
    color: #ef4444;
    transform: scale(1.15);
}

.fav-btn.is-fav {
    color: #ef4444;
}

/* Card needs relative for fav-btn positioning */
.tool-card {
    position: relative;
}

/* ─ Pinned Section ─ */
.pinned-section {
    margin-bottom: 1.5rem;
}

.pinned-section .section-label {
    color: var(--primary);
}