/* ============================================================================
   Formatomat — Industrial metal themes
   ============================================================================ */

/* Copper — dark, warm, patinated (default dark) */
:root[data-theme="copper"] {
    --bg:            #1a1410;
    --bg-panel:      #221a12;
    --bg-raised:     #2c2418;
    --bg-inset:      #120e09;
    --fg:            #e8dcc8;
    --fg-dim:        #9a8a74;
    --fg-muted:      #6b5d48;
    --accent:        #d9924a;
    --accent-dim:    #7a4e22;
    --highlight:     #e8c048;
    --danger:        #d85545;
    --success:       #7ba85a;
    --border:        #3a2d20;
    --border-strong: #564230;
    --shadow:        0 4px 0 0 #080604;
    --scanline:      rgba(255,255,255,0.008);
}

/* Iron — dark, very dark, rust accent */
:root[data-theme="iron"] {
    --bg:            #0f0e0d;
    --bg-panel:      #181614;
    --bg-raised:     #221f1c;
    --bg-inset:      #0a0908;
    --fg:            #d4ccc4;
    --fg-dim:        #857d74;
    --fg-muted:      #5a5248;
    --accent:        #b8532d;
    --accent-dim:    #6a2e18;
    --highlight:     #d4944a;
    --danger:        #d04040;
    --success:       #6a9450;
    --border:        #302c28;
    --border-strong: #4a4440;
    --shadow:        0 4px 0 0 #060504;
    --scanline:      rgba(255,255,255,0.006);
}

/* Brass — light, warm yellow-gold */
:root[data-theme="brass"] {
    --bg:            #f0e8d2;
    --bg-panel:      #e8dcc0;
    --bg-raised:     #f5eedd;
    --bg-inset:      #e0d4b8;
    --fg:            #2c2010;
    --fg-dim:        #6b5828;
    --fg-muted:      #9a8850;
    --accent:        #8f6f1a;
    --accent-dim:    #c4a040;
    --highlight:     #c8880c;
    --danger:        #b02a18;
    --success:       #4a7a28;
    --border:        #c8b880;
    --border-strong: #a89450;
    --shadow:        0 4px 0 0 #c0ae70;
    --scanline:      rgba(0,0,0,0.025);
}

/* Steel — light, cool blue-gray */
:root[data-theme="steel"] {
    --bg:            #e4e8ee;
    --bg-panel:      #d8dee8;
    --bg-raised:     #edf0f5;
    --bg-inset:      #ccd2dc;
    --fg:            #18283a;
    --fg-dim:        #4a6080;
    --fg-muted:      #788aa0;
    --accent:        #2a5a8a;
    --accent-dim:    #5a88b8;
    --highlight:     #2888c8;
    --danger:        #b83030;
    --success:       #2a7a48;
    --border:        #b0bcc8;
    --border-strong: #7a94aa;
    --shadow:        0 4px 0 0 #a8b4c0;
    --scanline:      rgba(0,0,0,0.02);
}

/* Pewter — light, warm neutral gray (default light) */
:root[data-theme="pewter"] {
    --bg:            #e8e4dc;
    --bg-panel:      #dcd8d0;
    --bg-raised:     #f0ede8;
    --bg-inset:      #d0ccc4;
    --fg:            #282420;
    --fg-dim:        #5a5248;
    --fg-muted:      #847c70;
    --accent:        #5a5044;
    --accent-dim:    #8a8078;
    --highlight:     #786050;
    --danger:        #9a3428;
    --success:       #4a7038;
    --border:        #b8b2a8;
    --border-strong: #8a847a;
    --shadow:        0 4px 0 0 #b0aaa0;
    --scanline:      rgba(0,0,0,0.02);
}

/* Fonts ----------------------------------------------------------------------- */

@font-face {
    font-family: "IBM Plex Mono";
    src: url("../fonts/ibm-plex-mono/ibm-plex-mono-latin-400-normal.woff2") format("woff2");
    font-weight: 400;
    font-style: normal;
    font-display: swap;
}

:root {
    --font-mono: "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;
    --font-ui:   "IBM Plex Mono", ui-monospace, system-ui, -apple-system, sans-serif;
}

/* Reset & base ============================================================== */

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

html, body {
    margin: 0;
    padding: 0;
    height: 100%;
}

body {
    font-family: var(--font-mono);
    font-size: 14px;
    line-height: 1.5;
    background: var(--bg);
    color: var(--fg);
    -webkit-font-smoothing: antialiased;
    background-image:
        repeating-linear-gradient(0deg, transparent 0, transparent 2px, var(--scanline) 2px, var(--scanline) 3px);
}

button, select, input, textarea {
    font-family: inherit;
    font-size: inherit;
    color: inherit;
}

.sr-only {
    position: absolute;
    width: 1px; height: 1px;
    padding: 0; margin: -1px;
    overflow: hidden; clip: rect(0,0,0,0);
    white-space: nowrap; border: 0;
}

/* Layout ==================================================================== */

.page-wrapper {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px 10px;
    gap: 20px;
}

/* Header ==================================================================== */

.header {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    gap: 20px;
    padding-bottom: 16px;
    border-bottom: 2px solid var(--border);
    position: relative;
}

.header::after {
    content: "";
    position: absolute;
    bottom: -6px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--border);
    opacity: 0.5;
}

.header-left { display: flex; flex-direction: column; gap: 4px; }

.logo { display: flex; align-items: center; gap: 12px; }

.logo-icon { width: 52px; height: 52px; flex-shrink: 0; }

.logo-text {
    font-family: var(--font-display);
    font-size: 2.4rem;
    font-weight: normal;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--fg);
    margin: 0;
    line-height: 1;
}

.tagline {
    margin: 0;
    padding-left: 64px;
    color: var(--fg-dim);
    font-size: 0.85rem;
    font-style: italic;
    letter-spacing: 0.02em;
}

.header-right {
    display: flex;
    gap: 10px;
    align-items: center;
}

/* Chunky select (shared) ==================================================== */

.chunky-select {
    appearance: none;
    -webkit-appearance: none;
    background: var(--bg-raised);
    color: var(--fg);
    border: 2px solid var(--border-strong);
    padding: 8px 32px 8px 12px;
    border-radius: 2px;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    cursor: pointer;
    box-shadow: var(--shadow);
    background-image:
        linear-gradient(45deg, transparent 50%, var(--accent) 50%),
        linear-gradient(135deg, var(--accent) 50%, transparent 50%);
    background-position:
        calc(100% - 16px) calc(50% - 2px),
        calc(100% - 10px) calc(50% - 2px);
    background-size: 6px 6px, 6px 6px;
    background-repeat: no-repeat;
    transition: translate 80ms, box-shadow 80ms;
}

.chunky-select:hover {
    border-color: var(--accent);
}

.chunky-select:active {
    translate: 0 2px;
    box-shadow: 0 2px 0 0 rgba(0,0,0,0.5);
}

.chunky-select:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

/* Main layout =============================================================== */

.main {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 16px;
    min-height: 0;
}

/* Format bar ================================================================ */

.format-bar {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 10px 16px;
    background: var(--bg-panel);
    border: 2px solid var(--border);
    border-radius: 2px;
    box-shadow: var(--shadow);
}

.format-bar-label {
    font-family: var(--font-display);
    font-size: 1.1rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--accent);
}

.format-bar-status {
    margin-left: auto;
    font-size: 0.8rem;
    color: var(--fg-dim);
    font-style: italic;
}

.format-bar-status.auto {
    color: var(--success);
}

/* Format tabs =============================================================== */

.format-tabs {
    display: flex;
    gap: 4px;
    flex-wrap: wrap;
}

.format-tab {
    background: var(--bg-raised);
    color: var(--fg-dim);
    border: 2px solid var(--border);
    padding: 6px 14px;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    cursor: pointer;
    border-radius: 2px;
    position: relative;
    transition: color 120ms, border-color 120ms, background 120ms;
}

.format-tab:hover:not(.active) {
    color: var(--fg);
    border-color: var(--accent-dim);
}

.format-tab.active {
    background: var(--accent);
    color: var(--bg);
    border-color: var(--accent);
}

.format-tab.active::after {
    content: "";
    position: absolute;
    bottom: -5px;
    left: 50%;
    translate: -50% 0;
    width: 6px;
    height: 6px;
    background: var(--accent);
    rotate: 45deg;
    border: 2px solid var(--accent);
}

.format-tabs.compact .format-tab {
    padding: 4px 10px;
    font-size: 0.75rem;
}

.format-tabs.compact .format-tab.active::after {
    display: none;
}

/* Panels grid =============================================================== */

.panels {
    flex: 1;
    display: grid;
    grid-template-columns: 1fr 210px 1fr;
    gap: 16px;
    min-height: 0;
}

.panel {
    display: flex;
    flex-direction: column;
    background: var(--bg-panel);
    border: 2px solid var(--border);
    border-radius: 2px;
    box-shadow: var(--shadow);
    min-height: 0;
    min-width: 0;
}

.panel-input { border-left: 4px solid var(--accent); }
.panel-output { border-left: 4px solid var(--success); }

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 12px;
    border-bottom: 2px solid var(--border);
    background: var(--bg-raised);
}

.panel-label {
    font-family: var(--font-display);
    font-size: 1rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--fg);
}

.panel-actions {
    display: flex;
    gap: 4px;
}

.btn-icon {
    background: transparent;
    border: 1px solid transparent;
    color: var(--fg-dim);
    padding: 4px;
    width: 28px;
    height: 28px;
    cursor: pointer;
    border-radius: 2px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: color 120ms, border-color 120ms;
}

.btn-icon:hover {
    color: var(--accent);
    border-color: var(--border-strong);
}

.btn-icon:active {
    color: var(--highlight);
}

.btn-icon.success-flash {
    color: var(--success);
    border-color: var(--success);
}

.btn-icon svg { width: 16px; height: 16px; }

.btn-icon[data-tooltip] { position: relative; }

.btn-icon[data-tooltip]::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: calc(100% + 6px);
    left: 50%;
    transform: translateX(-50%);
    background: var(--bg-raised);
    color: var(--fg);
    border: 1px solid var(--border-strong);
    padding: 3px 8px;
    border-radius: 2px;
    font-size: 0.72rem;
    white-space: nowrap;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.12s ease 0s;
    z-index: 10;
}

.btn-icon[data-tooltip]:hover::after {
    opacity: 1;
    transition: opacity 0.12s ease 0.55s;
}

.editor {
    flex: 1;
    background: var(--bg-inset);
    color: var(--fg);
    border: none;
    padding: 14px 16px;
    font-family: var(--font-mono);
    font-size: 13px;
    line-height: 1.6;
    resize: none;
    outline: none;
    tab-size: 2;
    -moz-tab-size: 2;
    min-height: 320px;
}

.editor::placeholder {
    color: var(--fg-muted);
    font-style: italic;
}

.editor:focus {
    background: var(--bg-inset);
}

.editor.is-invalid {
    background: linear-gradient(180deg, rgba(216,85,69,0.08), transparent 60px);
}

.panel-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 6px 12px;
    border-top: 1px solid var(--border);
    min-height: 28px;
    font-size: 0.75rem;
    color: var(--fg-dim);
}

.panel-meta { font-family: var(--font-mono); }

.panel-error {
    color: var(--danger);
    font-family: var(--font-mono);
    font-size: 0.75rem;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    margin-left: 12px;
    max-width: 60%;
}

.panel-delta.positive { color: var(--success); }
.panel-delta.negative { color: var(--accent); }

/* Control column ============================================================ */

.control-column {
    display: flex;
    flex-direction: column;
    gap: 18px;
    padding: 16px 12px;
    background: var(--bg-panel);
    border: 2px solid var(--border);
    border-radius: 2px;
    box-shadow: var(--shadow);
    position: relative;
}

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

.control-label {
    font-family: var(--font-display);
    font-size: 0.9rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--accent);
}

.action-buttons {
    display: flex;
    gap: 4px;
}

.btn-chunky {
    flex: 1;
    background: var(--bg-raised);
    color: var(--fg-dim);
    border: 2px solid var(--border-strong);
    padding: 8px 10px;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    cursor: pointer;
    border-radius: 2px;
    transition: color 120ms, border-color 120ms, background 120ms;
    box-shadow: var(--shadow);
}

.btn-chunky:hover:not(.active) {
    color: var(--fg);
    border-color: var(--accent-dim);
}

.btn-chunky.active {
    background: var(--accent);
    color: var(--bg);
    border-color: var(--accent);
}

.btn-chunky:active {
    translate: 0 2px;
    box-shadow: 0 2px 0 0 rgba(0,0,0,0.5);
}

.btn-chunky:disabled {
    opacity: 0.35;
    cursor: not-allowed;
    box-shadow: none;
}

.checkbox-row {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.85rem;
    cursor: pointer;
    color: var(--fg);
}

.checkbox-row input[type="checkbox"] {
    appearance: none;
    -webkit-appearance: none;
    width: 18px;
    height: 18px;
    background: var(--bg-raised);
    border: 2px solid var(--border-strong);
    border-radius: 2px;
    cursor: pointer;
    position: relative;
    flex-shrink: 0;
}

.checkbox-row input[type="checkbox"]:checked {
    background: var(--accent);
    border-color: var(--accent);
}

.checkbox-row input[type="checkbox"]:checked::after {
    content: "";
    position: absolute;
    inset: 0;
    background-image: linear-gradient(45deg, transparent 40%, var(--bg) 40% 60%, transparent 60%),
                      linear-gradient(-45deg, transparent 40%, var(--bg) 40% 60%, transparent 60%);
    background-position: 3px 6px, 6px 3px;
    background-size: 8px 2px, 2px 8px;
    background-repeat: no-repeat;
}

.arrow-indicator {
    margin-top: auto;
    display: flex;
    justify-content: center;
    padding-top: 8px;
}

.arrow-indicator svg { width: 40px; }

/* Footer ==================================================================== */

.footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 16px;
    border-top: 2px solid var(--border);
    font-size: 0.72rem;
    color: var(--fg-dim);
}

.footer a {
    color: var(--accent);
    text-decoration: none;
    border-bottom: 1px dotted var(--accent-dim);
}

.footer a:hover {
    color: var(--highlight);
    border-bottom-style: solid;
}

:root[data-theme="brass"] .footer a,
:root[data-theme="steel"] .footer a,
:root[data-theme="pewter"] .footer a {
    color: var(--fg);
    border-bottom-color: var(--fg-dim);
}

:root[data-theme="brass"] .footer a:hover,
:root[data-theme="steel"] .footer a:hover,
:root[data-theme="pewter"] .footer a:hover {
    color: var(--accent);
    border-bottom-color: var(--accent);
}

/* Responsive ================================================================= */

@media (max-width: 960px) {
    .panels {
        grid-template-columns: 1fr;
        grid-template-rows: 1fr auto 1fr;
    }
    .control-column {
        flex-direction: row;
        flex-wrap: wrap;
        align-items: center;
        gap: 12px;
    }
    .arrow-indicator {
        display: none;
    }
    .header {
        flex-direction: column;
        align-items: flex-start;
    }
    .tagline { padding-left: 0; }
}

@media (max-width: 600px) {
    .page-wrapper { padding: 12px; }
    .logo-text { font-size: 1.8rem; }
    .tagline { display: none; }
    .format-bar { flex-wrap: wrap; }
    .format-bar-status { margin-left: 0; width: 100%; }
}

/* Modals ==================================================================== */

.modal {
    position: fixed;
    inset: 0;
    z-index: 100;
    display: none;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.modal.is-open {
    display: flex;
}

.modal-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(0,0,0,0.6);
}

.modal-dialog {
    position: relative;
    background: var(--bg-panel);
    color: var(--fg);
    border: 2px solid var(--border-strong);
    border-radius: 2px;
    box-shadow: 0 8px 0 0 rgba(0,0,0,0.5);
    max-width: 540px;
    width: 100%;
    padding: 28px 28px 24px;
    max-height: 90vh;
    overflow-y: auto;
}

.modal-dialog h2 {
    font-family: var(--font-display);
    font-size: 1.6rem;
    font-weight: normal;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--accent);
    margin: 0 0 16px;
    border-bottom: 2px solid var(--border);
    padding-bottom: 8px;
}

.modal-dialog p {
    margin: 0 0 10px;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    line-height: 1.6;
}

.modal-dialog a {
    color: var(--accent);
    text-decoration: none;
    border-bottom: 1px dotted var(--accent-dim);
}

.modal-dialog a:hover {
    color: var(--highlight);
    border-bottom-style: solid;
}

.modal-close {
    position: absolute;
    top: 8px;
    right: 12px;
    background: transparent;
    color: var(--fg-dim);
    border: none;
    font-size: 1.6rem;
    line-height: 1;
    cursor: pointer;
    padding: 4px 8px;
}

.modal-close:hover {
    color: var(--accent);
}