:root {
    --bg: #0d1310;
    --bg-elev: #141c17;
    --bg-elev-2: #1a241e;
    --border: #233028;
    --text: #e6ece8;
    --text-muted: #8a9991;
    --accent: #2f7d4f;
    --accent-bright: #4ea96f;
    --accent-dim: #1c4a30;
    --danger: #a3503f;
    --radius: 10px;
    --shadow: 0 6px 24px rgba(0, 0, 0, 0.4);
    --font-display: "Cormorant Garamond", "Iowan Old Style", Georgia, serif;
    --font-body: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
    box-sizing: border-box;
}

* {
    scrollbar-width: thin;
    scrollbar-color: var(--accent-dim) transparent;
}

*::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

*::-webkit-scrollbar-track {
    background: transparent;
}

*::-webkit-scrollbar-thumb {
    background: var(--accent-dim);
    border-radius: 8px;
    border: 2px solid transparent;
    background-clip: padding-box;
    transition: background 120ms ease;
}

*::-webkit-scrollbar-thumb:hover {
    background: var(--accent);
    background-clip: padding-box;
    border: 2px solid transparent;
}

*::-webkit-scrollbar-corner {
    background: transparent;
}

html {
    scrollbar-color: var(--accent-dim) var(--bg);
}

html::-webkit-scrollbar {
    width: 12px;
    height: 12px;
}

html::-webkit-scrollbar-track {
    background: var(--bg);
    border-left: 1px solid var(--border);
}

html, body {
    margin: 0;
    padding: 0;
    background: var(--bg);
    color: var(--text);
    font-family: var(--font-body);
    min-height: 100vh;
    font-size: 16px;
    line-height: 1.5;
}

body {
    background:
        radial-gradient(ellipse at 20% -10%, rgba(47, 125, 79, 0.12), transparent 50%),
        radial-gradient(ellipse at 100% 100%, rgba(47, 125, 79, 0.06), transparent 50%),
        var(--bg);
    display: flex;
    flex-direction: column;
}

.site-header {
    padding: 3.5rem 2rem 2rem;
    max-width: 1100px;
    margin: 0 auto;
    width: 100%;
    border-bottom: 1px solid var(--border);
}

.brand {
    display: flex;
    align-items: baseline;
    gap: 0.6rem;
}

.brand-mark {
    color: var(--accent-bright);
    font-family: var(--font-display);
    font-size: 2.4rem;
    line-height: 1;
}

.brand h1 {
    margin: 0;
    font-family: var(--font-display);
    font-weight: 500;
    font-size: 2.2rem;
    letter-spacing: 0.01em;
}

.tagline {
    margin: 0.4rem 0 0;
    color: var(--text-muted);
    font-style: italic;
    font-family: var(--font-display);
    font-size: 1.1rem;
}

.layout {
    flex: 1;
    max-width: 1100px;
    margin: 0 auto;
    padding: 2.5rem 2rem;
    width: 100%;
    display: grid;
    grid-template-columns: 1.6fr 1fr;
    gap: 1.5rem;
}

@media (max-width: 780px) {
    .layout {
        grid-template-columns: 1fr;
    }
}

.panel {
    background: var(--bg-elev);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.5rem;
    box-shadow: var(--shadow);
    min-width: 0;
}

@media (max-width: 520px) {
    .panel { padding: 1rem; }
    .layout { padding: 1.25rem 1rem; }
    .site-header { padding: 2rem 1rem 1.25rem; }
}

.panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1.25rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--border);
}

.panel-header h2 {
    margin: 0;
    font-family: var(--font-display);
    font-weight: 500;
    font-size: 1.4rem;
    letter-spacing: 0.02em;
}

.panel-meta {
    color: var(--text-muted);
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.search-wrap {
    margin-bottom: 1rem;
    position: relative;
}

.search-input {
    width: 100%;
    background: var(--bg-elev-2);
    border: 1px solid var(--border);
    border-radius: 7px;
    color: var(--text);
    padding: 0.65rem 0.9rem 0.65rem 2.1rem;
    font-family: inherit;
    font-size: 0.95rem;
    transition: border-color 120ms ease, box-shadow 120ms ease;
    background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%238a9991' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'><circle cx='11' cy='11' r='7'/><line x1='21' y1='21' x2='16.65' y2='16.65'/></svg>");
    background-repeat: no-repeat;
    background-position: 0.65rem center;
    background-size: 1rem 1rem;
}

.search-input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(47, 125, 79, 0.18);
}

.search-input::placeholder {
    color: var(--text-muted);
}

.calc-list,
.saved-list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
}

.calc-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 1.1rem;
    background: var(--bg-elev-2);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text);
    text-decoration: none;
    transition: border-color 120ms ease, transform 120ms ease, background 120ms ease;
}

.calc-item:hover {
    border-color: var(--accent);
    background: #1d2a22;
    transform: translateY(-1px);
}

.calc-item .calc-name {
    font-family: var(--font-display);
    font-size: 1.2rem;
    font-weight: 500;
}

.calc-item .calc-desc {
    display: block;
    color: var(--text-muted);
    font-size: 0.85rem;
    margin-top: 0.15rem;
}

.calc-item .calc-arrow {
    color: var(--accent-bright);
    font-size: 1.2rem;
}

.saved-item {
    padding: 0.8rem 0.9rem;
    background: var(--bg-elev-2);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    display: flex;
    flex-direction: column;
    gap: 0.3rem;
    cursor: pointer;
    transition: border-color 120ms ease, background 120ms ease, transform 120ms ease;
}

.saved-item:hover,
.saved-item:focus-visible {
    border-color: var(--accent);
    background: #1d2a22;
    outline: none;
    transform: translateY(-1px);
}

.saved-item .saved-head {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    gap: 0.5rem;
}

.saved-item .saved-title {
    font-weight: 500;
    color: var(--text);
}

.saved-item .saved-source {
    color: var(--accent-bright);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.saved-item .saved-expr {
    color: var(--text-muted);
    font-family: "JetBrains Mono", "Consolas", monospace;
    font-size: 0.85rem;
    word-break: break-all;
}

.saved-item .saved-actions {
    display: flex;
    gap: 0.4rem;
    margin-top: 0.4rem;
}

.empty-state {
    color: var(--text-muted);
    font-style: italic;
    margin: 0;
    padding: 0.5rem 0.25rem;
}

.btn-ghost {
    background: transparent;
    color: var(--text-muted);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 0.35rem 0.7rem;
    font-size: 0.8rem;
    cursor: pointer;
    font-family: inherit;
    transition: color 120ms ease, border-color 120ms ease;
}

.btn-ghost:hover {
    color: var(--accent-bright);
    border-color: var(--accent);
}

.btn-mini {
    background: transparent;
    color: var(--text-muted);
    border: 1px solid var(--border);
    border-radius: 5px;
    padding: 0.25rem 0.55rem;
    font-size: 0.75rem;
    cursor: pointer;
    font-family: inherit;
}

.btn-mini:hover {
    color: var(--accent-bright);
    border-color: var(--accent);
}

.btn-mini.danger:hover {
    color: var(--danger);
    border-color: var(--danger);
}

.modal-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(5, 9, 7, 0.65);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: 1rem;
    animation: modal-fade 140ms ease;
}

.modal-backdrop[hidden] {
    display: none;
}

body.modal-open {
    overflow: hidden;
}

.modal {
    background: var(--bg-elev);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.55);
    padding: 1.5rem;
    width: 100%;
    max-width: 420px;
    animation: modal-pop 160ms ease;
}

.modal-title {
    font-family: var(--font-display);
    font-weight: 500;
    font-size: 1.4rem;
    margin: 0 0 0.5rem;
    color: var(--text);
    letter-spacing: 0.01em;
}

.modal-label {
    display: block;
    color: var(--text-muted);
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: 0.4rem;
}

.modal-label[hidden] {
    display: none;
}

.modal-input {
    width: 100%;
    background: var(--bg-elev-2);
    border: 1px solid var(--border);
    border-radius: 7px;
    color: var(--text);
    padding: 0.7rem 0.85rem;
    font-family: inherit;
    font-size: 1rem;
    transition: border-color 120ms ease, box-shadow 120ms ease;
    box-sizing: border-box;
}

.modal-input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(47, 125, 79, 0.18);
}

.modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: 0.6rem;
    margin-top: 1.25rem;
}

@keyframes modal-fade {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes modal-pop {
    from { opacity: 0; transform: translateY(8px) scale(0.98); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}

.modal-detail {
    max-width: 520px;
    max-height: calc(100vh - 2rem);
    overflow-y: auto;
}

.modal-detail-head {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 1rem;
    margin-bottom: 1rem;
}

.modal-detail-meta {
    display: flex;
    gap: 0.75rem;
    align-items: center;
    margin-top: 0.4rem;
    flex-wrap: wrap;
}

.modal-detail-date {
    color: var(--text-muted);
    font-size: 0.8rem;
}

.modal-close {
    background: var(--bg-elev-2);
    border: 1px solid var(--border);
    color: var(--text-muted);
    width: 34px;
    height: 34px;
    border-radius: 50%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    padding: 0;
    flex-shrink: 0;
    transition: color 140ms ease, border-color 140ms ease, background 140ms ease, transform 140ms ease;
}

.modal-close svg {
    display: block;
}

.modal-close:hover {
    color: var(--accent-bright);
    border-color: var(--accent);
    background: rgba(47, 125, 79, 0.12);
    transform: rotate(90deg);
}

.modal-close:focus-visible {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(47, 125, 79, 0.25);
}

.modal-close:active {
    transform: rotate(90deg) scale(0.94);
}

.modal-detail-result {
    background: var(--bg-elev-2);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1rem 1.1rem;
    display: flex;
    flex-direction: column;
    gap: 0.3rem;
    margin-bottom: 1.25rem;
}

.modal-detail-section {
    font-family: var(--font-display);
    font-weight: 500;
    font-size: 1.1rem;
    margin: 0 0 0.6rem;
    color: var(--text);
}

.kv-list {
    margin: 0;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.5rem 1rem;
}

.kv-list dt {
    color: var(--text-muted);
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    align-self: end;
}

.kv-list dd {
    margin: 0;
    color: var(--text);
    font-size: 0.95rem;
    word-break: break-word;
}

.modal-detail-expression {
    margin: 1rem 0 0;
    padding: 0.7rem 0.85rem;
    background: var(--bg-elev-2);
    border-left: 2px solid var(--accent);
    border-radius: 5px;
    color: var(--text-muted);
    font-family: "JetBrains Mono", "Consolas", monospace;
    font-size: 0.82rem;
    word-break: break-word;
}

@media (max-width: 520px) {
    .kv-list { grid-template-columns: 1fr; gap: 0.3rem; }
    .kv-list dd { margin-bottom: 0.5rem; }
}

.modal-detail-actions {
    margin-top: 1.5rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border);
    justify-content: stretch;
}

.btn-modal-close {
    flex: 1;
    background: transparent;
    color: var(--accent-bright);
    border: 1px solid var(--accent-dim);
    border-radius: 7px;
    padding: 0.7rem 1.1rem;
    font-family: inherit;
    font-size: 0.95rem;
    letter-spacing: 0.02em;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    transition: background 140ms ease, border-color 140ms ease, color 140ms ease, transform 140ms ease;
}

.btn-modal-close svg {
    display: block;
}

.btn-modal-close:hover {
    background: var(--accent);
    border-color: var(--accent);
    color: #fff;
}

.btn-modal-close:focus-visible {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(47, 125, 79, 0.25);
}

.btn-modal-close:active {
    transform: translateY(1px);
}

.site-footer {
    max-width: 1100px;
    margin: 0 auto;
    padding: 1.5rem 2rem 2.5rem;
    width: 100%;
    color: var(--text-muted);
    font-size: 0.8rem;
    text-align: center;
    border-top: 1px solid var(--border);
}