/* ─── RESET & VARIABLES ─── */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --bg-app: #1a1a18;
    --bg-surface: #242420;
    --bg-input: #0e0e0c;
    --border: #4a4a45;
    --border-highlight: #6a6a60;
    --border-focus: #7a8a6a;
    --text-primary: #cfcfc0;
    --text-secondary: #a0a090;
    --text-muted: #6a6a60;
    --accent-green: #5a7a4a;
    --accent-green-glow: #6a9a5a;
    --accent-amber: #e8a830;
    --accent-red: #c04040;
    --shadow-inset: inset 0 2px 4px rgba(0, 0, 0, 0.6);
    --shadow-drop: 0 4px 12px rgba(0, 0, 0, 0.8);
    --font: 'Roboto Mono', 'Courier New', monospace;
    --transition-tactile: cubic-bezier(0.34, 1.2, 0.64, 1);
}

html,
body {
    height: 100vh;
    overflow: hidden;
    font-family: var(--font);
    background: var(--bg-app);
    color: var(--text-primary);
    font-weight: 400;
    font-size: 0.95rem;
    -webkit-font-smoothing: antialiased;
}

body {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 0.5rem;
}

.app {
    max-width: 1400px;
    width: 100%;
    height: 100%;
    background: var(--bg-surface);
    border: 2px solid var(--border);
    box-shadow: var(--shadow-drop), inset 0 0 0 1px rgba(255, 255, 255, 0.02);
    padding: 0.8rem 1.2rem 0.8rem;
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
    position: relative;
    overflow: hidden;
}
.app::before {
    content: '';
    position: absolute;
    top: 8px;
    left: 8px;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: radial-gradient(circle at 30% 30%, #5a5a55, #2a2a25);
    box-shadow: inset 0 1px 2px #000, 0 0 0 1px #3a3a35;
}
.app::after {
    content: '';
    position: absolute;
    top: 8px;
    right: 8px;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: radial-gradient(circle at 30% 30%, #5a5a55, #2a2a25);
    box-shadow: inset 0 1px 2px #000, 0 0 0 1px #3a3a35;
}

@media (max-width: 680px) {
    .app {
        padding: 0.6rem;
    }
    .app::before,
    .app::after {
        display: none;
    }
}
@media (max-height: 700px) {
    .app {
        padding: 0.4rem 0.6rem;
        gap: 0.25rem;
    }
    .header .badge-version,
    .header .sub .warning {
        display: none;
    }
    .app::before,
    .app::after {
        display: none;
    }
    .intent-banner .limitation {
        display: none;
    }
    .app-footer {
        display: none;
    }
}

/* ─── HEADER ─── */
.header {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 0.15rem 0.8rem;
    padding-bottom: 0.15rem;
    border-bottom: 2px solid var(--border);
    margin-bottom: 0.15rem;
    flex-shrink: 0;
}
.header .sys-id {
    display: flex;
    align-items: center;
    gap: 0.6rem;
}
.header h1 {
    font-size: 1.25rem;
    font-weight: 500;
    letter-spacing: 0.08em;
    color: var(--text-primary);
    text-transform: uppercase;
}
.header h1 .brand {
    color: var(--accent-amber);
    font-weight: 700;
}
.header h1 .tag {
    font-weight: 300;
    color: var(--text-muted);
    letter-spacing: 0.15em;
    font-size: 0.8rem;
}
.header .badge-version {
    font-size: 0.65rem;
    font-weight: 400;
    background: var(--bg-input);
    border: 1px solid var(--border);
    padding: 0.1rem 0.5rem;
    color: var(--text-secondary);
    letter-spacing: 0.05em;
    text-transform: uppercase;
}
.header .sub {
    font-size: 0.65rem;
    color: var(--text-muted);
    font-weight: 300;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    width: 100%;
    flex-shrink: 0;
}
.header .sub .warning {
    color: var(--accent-red);
    font-weight: 500;
    margin-left: 0.3rem;
}

/* ─── ADAPTIVE BANNER ─── */
.adaptive-banner {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    padding: 0.4rem 0.6rem;
    background: var(--bg-input);
    border-left: 4px solid #4a6a8a;
    font-size: 0.7rem;
    margin-bottom: 0.2rem;
    flex-shrink: 0;
}
.adaptive-banner.hidden {
    display: none;
}
.adaptive-banner .icon {
    font-size: 0.9rem;
}
.adaptive-banner .content {
    display: flex;
    flex-direction: column;
    gap: 0.15rem;
    flex: 1;
}
.adaptive-banner .title {
    font-weight: 500;
    color: var(--text-primary);
}
.adaptive-banner .detail {
    color: var(--text-secondary);
    font-size: 0.65rem;
}
.adaptive-banner .metrics {
    display: flex;
    gap: 0.8rem;
    margin-top: 0.05rem;
}
.adaptive-banner .metric {
    display: flex;
    gap: 0.2rem;
    align-items: baseline;
    font-size: 0.6rem;
}
.adaptive-banner .metric-value {
    font-weight: 600;
    color: #4a9a5a;
}
.adaptive-banner .metric-label {
    color: var(--text-muted);
    text-transform: uppercase;
}

/* ─── INTENT BANNER ─── */
.intent-banner {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.3rem 0.8rem;
    padding: 0.2rem 0.6rem;
    background: var(--bg-input);
    border-left: 4px solid var(--accent-amber);
    font-size: 0.7rem;
    color: var(--text-secondary);
    line-height: 1.2;
    margin: 0.15rem 0 0.15rem 0;
    border: 1px solid var(--border);
    border-left-width: 4px;
    flex-shrink: 0;
}
.intent-banner .best-for {
    font-weight: 600;
    color: var(--accent-amber);
    letter-spacing: 0.06em;
    text-transform: uppercase;
    font-size: 0.65rem;
}
.intent-banner .limitation {
    margin-left: auto;
    background: var(--bg-surface);
    border: 1px solid var(--border);
    padding: 0.05rem 0.5rem;
    font-size: 0.6rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--accent-red);
    font-weight: 600;
    cursor: help;
    white-space: nowrap;
}

/* ─── SETTINGS GROUPS ─── */
.settings-groups {
    display: flex;
    flex-direction: row;
    flex-wrap: wrap;
    gap: 0.3rem;
    padding: 0.2rem 0 0.25rem 0;
    border-bottom: 2px solid var(--border);
    flex-shrink: 0;
}
.settings-group {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.15rem 0.8rem;
    padding: 0.15rem 0.5rem;
    background: var(--bg-input);
    border: 1px solid var(--border);
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.4);
    flex: 1 0 auto;
}
.settings-group .group-title {
    font-size: 0.65rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--accent-amber);
    margin-right: 0.1rem;
    min-width: 60px;
    flex-shrink: 0;
    border-right: 1px solid var(--border);
    padding-right: 0.5rem;
}

/* Toggles */
.settings-group .toggle-group {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.05rem 0;
}
.settings-group .toggle-group .info .label {
    font-size: 0.65rem;
    font-weight: 400;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--text-secondary);
    border-bottom: 1px dotted var(--text-muted);
    padding-bottom: 1px;
}
.toggle {
    position: relative;
    width: 38px;
    height: 22px;
    flex-shrink: 0;
    cursor: pointer;
}
.toggle input {
    opacity: 0;
    width: 0;
    height: 0;
    position: absolute;
}
.toggle .slider {
    position: absolute;
    inset: 0;
    background: #2a2a28;
    border: 2px solid var(--border);
    border-radius: 2px;
    transition: all 0.2s var(--transition-tactile);
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.6);
}
.toggle .slider::after {
    content: '';
    position: absolute;
    height: 14px;
    width: 14px;
    left: 2px;
    bottom: 2px;
    background: #4a4a45;
    border: 1px solid #3a3a35;
    transition: all 0.25s var(--transition-tactile);
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.4);
}
.toggle input:checked+.slider {
    background: var(--accent-green);
    border-color: var(--accent-green-glow);
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.4), 0 0 12px rgba(90, 122, 74, 0.3);
}
.toggle input:checked+.slider::after {
    transform: translateX(18px);
    background: #cfcfc0;
    border-color: #afaf9a;
}
.toggle input:focus-visible+.slider {
    outline: 2px solid var(--accent-amber);
    outline-offset: 2px;
}

.toggle.slimdown-toggle input:checked+.slider {
    background: var(--accent-amber);
    border-color: #f0b840;
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.4), 0 0 16px rgba(232, 168, 48, 0.25);
}
.toggle.slimdown-toggle input:checked+.slider::after {
    background: #1a1a18;
    border-color: #3a3a35;
}

.toggle.huffman-toggle input:checked+.slider {
    background: #b08030;
    border-color: #d09040;
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.4), 0 0 16px rgba(176, 128, 48, 0.25);
}
.toggle.huffman-toggle input:checked+.slider::after {
    background: #cfcfc0;
    border-color: #afaf9a;
}

.alias-radio-group {
    display: flex;
    align-items: center;
    gap: 0.2rem 0.6rem;
    flex-wrap: wrap;
}
.alias-radio-group .label {
    font-size: 0.65rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--text-muted);
}
.alias-radio-group label.radio {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    font-size: 0.65rem;
    cursor: help;
    color: var(--text-secondary);
    text-transform: uppercase;
}
.alias-radio-group label.radio input[type="radio"] {
    accent-color: var(--accent-green);
    width: 12px;
    height: 12px;
    cursor: pointer;
    filter: drop-shadow(0 1px 2px rgba(0, 0, 0, 0.4));
}

/* ─── ACTION ROW ─── */
.action-row {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.3rem;
    padding: 0.25rem 0 0.15rem 0;
    border-bottom: 2px solid var(--border);
    padding-bottom: 0.25rem;
    flex-shrink: 0;
}
.btn {
    font-family: var(--font);
    font-weight: 600;
    font-size: 0.7rem;
    letter-spacing: 0.06em;
    padding: 0.25rem 0.8rem;
    background: var(--bg-input);
    border: 2px solid var(--border);
    border-bottom-width: 4px;
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.1s var(--transition-tactile);
    box-shadow: 0 2px 0 rgba(0, 0, 0, 0.3);
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    text-transform: uppercase;
    white-space: nowrap;
    border-radius: 0px;
}
.btn:hover {
    transform: translateY(-1px);
    border-color: var(--text-secondary);
    box-shadow: 0 4px 0 rgba(0, 0, 0, 0.3);
}
.btn:active {
    transform: translateY(2px);
    border-bottom-width: 2px;
    box-shadow: 0 1px 0 rgba(0, 0, 0, 0.3);
}
.btn-primary {
    background: var(--accent-green);
    border-color: #3a5a2a;
    color: #1a1a18;
    box-shadow: 0 2px 0 #1a2a12;
}
.btn-primary:hover {
    background: var(--accent-green-glow);
    border-color: #4a6a3a;
}
.btn-purple {
    background: var(--accent-amber);
    border-color: #b08020;
    color: #1a1a18;
    box-shadow: 0 2px 0 #705010;
}
.btn-purple:hover {
    background: #f0b840;
    border-color: #d09030;
}
.btn-secondary {
    background: transparent;
    border-color: var(--border);
}
.btn-secondary:hover {
    background: #2a2a28;
}

.live-toggle-group {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    margin-left: 0.1rem;
}
.live-toggle-group .label {
    font-size: 0.65rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--text-muted);
    cursor: help;
}
.spinner-dot {
    display: none;
    width: 10px;
    height: 10px;
    border: 2px solid var(--border);
    border-top-color: var(--accent-amber);
    animation: spin 0.6s linear infinite;
    margin-left: 0.2rem;
    vertical-align: middle;
}
.spinner-dot.active {
    display: inline-block;
}
@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

.save-group {
    display: flex;
    align-items: center;
    gap: 0.3rem;
    margin-left: auto;
}
.save-group input[type="text"] {
    font-family: var(--font);
    font-size: 0.65rem;
    padding: 0.2rem 0.4rem;
    background: var(--bg-input);
    border: 1px solid var(--border);
    color: var(--text-primary);
    outline: none;
    width: 100px;
    transition: border 0.15s ease;
    text-transform: lowercase;
}
.save-group input[type="text"]:focus {
    border-color: var(--accent-green);
}
.save-group select {
    font-family: var(--font);
    font-size: 0.65rem;
    padding: 0.2rem 0.4rem;
    background: var(--bg-input);
    border: 1px solid var(--border);
    color: var(--text-primary);
    outline: none;
    cursor: pointer;
}

/* ─── PANELS ─── */
.panels {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.8rem;
    flex: 1;
    min-height: 0;
}
@media (max-width: 720px) {
    .panels {
        grid-template-columns: 1fr;
        gap: 0.4rem;
    }
}
.panel {
    display: flex;
    flex-direction: column;
    min-height: 0;
}
.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.1rem;
    padding: 0.1rem 0.4rem;
    background: var(--bg-input);
    border: 1px solid var(--border);
    flex-shrink: 0;
}
.panel-header .label {
    font-size: 0.65rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-muted);
}
.panel-header .label .slimdown-indicator {
    background: var(--accent-amber);
    color: #1a1a18;
    font-size: 0.55rem;
    padding: 0.05rem 0.4rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin-left: 0.3rem;
    font-weight: 700;
}
.panel-header .label .huffman-indicator {
    background: #b08030;
    color: #fff;
    font-size: 0.55rem;
    padding: 0.05rem 0.4rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin-left: 0.3rem;
    font-weight: 700;
}
.panel-header .char-count {
    font-size: 0.65rem;
    font-weight: 400;
    color: var(--text-muted);
    background: var(--bg-surface);
    padding: 0.05rem 0.4rem;
    border: 1px solid var(--border);
    font-family: var(--font);
}
.panel textarea {
    flex: 1;
    width: 100%;
    min-height: 60px;
    background: var(--bg-input);
    border: 2px solid var(--border);
    padding: 0.4rem 0.6rem;
    font-family: var(--font);
    font-size: 0.8rem;
    line-height: 1.5;
    color: var(--text-primary);
    resize: none;
    outline: none;
    transition: border 0.2s ease, box-shadow 0.2s ease;
    box-shadow: inset 0 4px 8px rgba(0, 0, 0, 0.6);
}
.panel textarea:focus {
    border-color: var(--accent-green);
    box-shadow: inset 0 4px 8px rgba(0, 0, 0, 0.6), 0 0 12px rgba(90, 122, 74, 0.1);
}
.panel textarea::placeholder {
    color: var(--text-muted);
    font-weight: 300;
    opacity: 0.6;
}
#outputArea {
    background: var(--bg-input);
    border-color: var(--border);
}

/* ─── STATS ─── */
.stats {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    padding: 0.15rem 0.8rem;
    background: var(--bg-input);
    border: 2px solid var(--border);
    gap: 0.4rem;
    margin-top: 0.15rem;
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.4);
    flex-shrink: 0;
}
.stats .metrics {
    display: flex;
    gap: 1.2rem;
    flex-wrap: wrap;
}
.stats .metric {
    display: flex;
    align-items: baseline;
    gap: 0.25rem;
    font-size: 0.65rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.04em;
    cursor: help;
}
.stats .metric .num {
    font-weight: 500;
    color: var(--accent-green-glow);
    font-variant-numeric: tabular-nums;
    font-size: 0.9rem;
    background: #0a0a08;
    padding: 0 0.4rem;
    border: 1px solid #2a2a28;
}
.stats .metric .num.loss {
    color: var(--accent-amber);
}
.stats .badge-ratio {
    font-size: 0.65rem;
    font-weight: 500;
    background: var(--bg-surface);
    border: 1px solid var(--border);
    padding: 0.05rem 0.5rem;
    color: var(--text-secondary);
    font-family: var(--font);
    cursor: help;
}

/* ─── FOOTER ─── */
.app-footer {
    margin-top: 0.2rem;
    padding-top: 0.2rem;
    border-top: 2px solid var(--border);
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.6rem;
    color: var(--text-muted);
    letter-spacing: 0.04em;
    font-weight: 300;
    flex-wrap: wrap;
    text-transform: uppercase;
    flex-shrink: 0;
}
.app-footer a {
    color: var(--text-secondary);
    text-decoration: none;
    border-bottom: 1px dotted var(--border);
    transition: color 0.15s ease, border-color 0.15s ease;
    font-weight: 400;
}
.app-footer a:hover {
    color: var(--accent-amber);
    border-bottom-color: var(--accent-amber);
}
.app-footer .heart {
    color: var(--accent-red);
    font-weight: 400;
    font-size: 0.7rem;
}

/* ─── CUSTOM TOOLTIPS ─── */
[data-tooltip] {
    position: relative;
    cursor: help;
}
[data-tooltip]:before,
[data-tooltip]:after {
    position: absolute;
    visibility: hidden;
    opacity: 0;
    transition: opacity 0.15s ease, visibility 0.15s ease;
    pointer-events: none;
    z-index: 9999;
}
[data-tooltip]:hover:before,
[data-tooltip]:hover:after,
[data-tooltip]:focus:before,
[data-tooltip]:focus:after,
[data-tooltip]:focus-visible:before,
[data-tooltip]:focus-visible:after {
    visibility: visible;
    opacity: 1;
}
[data-tooltip]:before {
    content: '';
    bottom: calc(100% - 2px);
    left: 50%;
    transform: translateX(-50%);
    border: 5px solid transparent;
    border-top-color: var(--border);
    z-index: 10000;
}
[data-tooltip]:after {
    content: attr(data-tooltip);
    bottom: calc(100% + 6px);
    left: 50%;
    transform: translateX(-50%);
    background: var(--bg-app);
    color: var(--text-primary);
    font-family: var(--font);
    font-size: 0.65rem;
    font-weight: 400;
    padding: 0.4rem 0.6rem;
    border: 2px solid var(--border);
    border-left: 4px solid var(--accent-amber);
    box-shadow: var(--shadow-drop);
    white-space: pre-wrap;
    word-wrap: break-word;
    min-width: 140px;
    max-width: 260px;
    text-align: left;
    line-height: 1.3;
    text-transform: none;
    letter-spacing: 0.02em;
    border-radius: 0px;
}

/* ─── TOAST ─── */
.toast-container {
    position: fixed;
    bottom: 1.5rem;
    left: 1.5rem;
    z-index: 9999;
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
    pointer-events: none;
}
.toast {
    pointer-events: auto;
    background: var(--bg-surface);
    border: 2px solid var(--border);
    border-left: 6px solid var(--accent-amber);
    padding: 0.4rem 0.8rem;
    box-shadow: var(--shadow-drop);
    font-family: var(--font);
    font-size: 0.8rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    animation: toastIn 0.3s var(--transition-tactile);
    max-width: 380px;
    color: var(--text-primary);
}
.toast.success {
    border-left-color: var(--accent-green);
}
.toast.error {
    border-left-color: var(--accent-red);
}
.toast.info {
    border-left-color: var(--accent-amber);
}
@keyframes toastIn {
    0% {
        opacity: 0;
        transform: translateY(20px) scale(0.96);
    }
    100% {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}
.toast.exit {
    animation: toastOut 0.2s ease forwards;
}
@keyframes toastOut {
    0% {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
    100% {
        opacity: 0;
        transform: translateY(12px) scale(0.94);
    }
}

#fileInput {
    display: none;
}

/* ─── RESPONSIVE ─── */
@media (max-width: 680px) {
    .settings-group {
        flex-direction: column;
        align-items: stretch;
        gap: 0.15rem;
        padding: 0.25rem;
    }
    .settings-group .group-title {
        border-right: none;
        border-bottom: 1px solid var(--border);
        padding-bottom: 0.1rem;
        min-width: unset;
    }
    .settings-group .toggle-group {
        justify-content: space-between;
    }
    .save-group {
        margin-left: 0;
        width: 100%;
        justify-content: stretch;
        flex-wrap: wrap;
    }
    .save-group input[type="text"] {
        flex: 1;
        min-width: 60px;
    }
    .action-row .btn {
        flex: 1;
        justify-content: center;
    }
    .live-toggle-group {
        margin-left: 0;
        width: 100%;
        justify-content: flex-start;
    }
    .app-footer {
        font-size: 0.55rem;
        gap: 0.2rem;
    }
    .intent-banner .limitation {
        margin-left: 0;
        width: 100%;
        text-align: center;
    }
    .header .sys-id .status-led {
        display: none;
    }
    .panels {
        min-height: 120px;
    }
}
@media (max-height: 600px) {
    .intent-banner {
        display: none;
    }
    .header .sub {
        display: none;
    }
    .app-footer {
        display: none;
    }
    .settings-groups .settings-group:last-child .alias-radio-group {
        display: none;
    }
    .stats .metrics .metric:nth-child(4),
    .stats .metrics .metric:nth-child(5) {
        display: none;
    }
}