:root {
    --bg: #090d16;
    --bg2: #0f172a;
    --card: #1e293b;
    --border: #334155;
    --text: #f8fafc;
    --muted: #94a3b8;
    --accent: #6366f1;
    --accent2: #818cf8;
    --green: #10b981;
    --amber: #f59e0b;
    --danger: #f87171;
    --mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
    --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body { background: var(--bg); color: var(--text); font-family: var(--sans); line-height: 1.5; -webkit-font-smoothing: antialiased; }

/* Navbar */
.navbar { background: rgba(15,23,42,.88); backdrop-filter: blur(12px); border-bottom: 1px solid var(--border); position: sticky; top: 0; z-index: 100; }
.nav-container { max-width: 1200px; margin: 0 auto; padding: 12px 20px; display: flex; justify-content: space-between; align-items: center; }
.logo { display: flex; align-items: center; gap: 10px; }
.logo-icon { font-size: 22px; }
.logo-text { font-size: 18px; font-weight: 800; }
.accent { color: var(--accent2); }
.badge { font-size: 11px; background: rgba(99,102,241,.2); color: var(--accent2); padding: 2px 8px; border-radius: 999px; font-weight: 600; border: 1px solid rgba(99,102,241,.35); }
.nav-right { display: flex; align-items: center; gap: 14px; }
.privacy-chip { font-size: 12px; background: rgba(16,185,129,.1); border: 1px solid rgba(16,185,129,.3); color: #34d399; padding: 4px 10px; border-radius: 999px; }
.nav-link { color: var(--muted); text-decoration: none; font-size: 13px; }
.nav-link:hover { color: var(--text); }

/* Container */
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

/* Hero */
.hero { text-align: center; padding: 36px 0 20px; }
.hero h1 { font-size: 34px; font-weight: 800; letter-spacing: -1px; margin-bottom: 10px; }
.gradient-text { background: linear-gradient(135deg, #818cf8, #06b6d4); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.subtitle { color: var(--muted); font-size: 15px; max-width: 680px; margin: 0 auto; }

/* Live Expression Hero */
.expression-hero {
    background: linear-gradient(145deg, #1e293b, #0f172a);
    border: 2px solid rgba(99,102,241,.4);
    border-radius: 16px;
    padding: 24px 28px;
    margin-bottom: 24px;
    text-align: center;
}
.expr-label { font-size: 11px; font-weight: 700; color: var(--accent2); text-transform: uppercase; letter-spacing: .7px; margin-bottom: 10px; }
.expr-display { display: flex; align-items: center; justify-content: center; gap: 14px; margin-bottom: 10px; }
.expr-display code {
    font-family: var(--mono);
    font-size: 32px;
    font-weight: 800;
    color: #818cf8;
    letter-spacing: 6px;
    background: rgba(99,102,241,.08);
    padding: 10px 24px;
    border-radius: 10px;
    border: 1px solid rgba(99,102,241,.25);
}
.btn-copy-expr {
    background: var(--accent);
    border: none;
    color: #fff;
    font-size: 13px;
    font-weight: 700;
    padding: 10px 18px;
    border-radius: 8px;
    cursor: pointer;
    transition: opacity .2s;
}
.btn-copy-expr:hover { opacity: .85; }
.expr-meaning { font-size: 16px; color: #a5b4fc; font-weight: 600; margin-bottom: 12px; }
.expr-fields-label { display: flex; justify-content: center; gap: 0; font-size: 11px; color: #64748b; font-weight: 600; text-transform: uppercase; letter-spacing: .5px; }
.expr-fields-label span { width: 96px; text-align: center; }

/* Tab Bar */
.tab-bar { display: flex; gap: 4px; background: var(--bg2); border: 1px solid var(--border); border-radius: 10px; padding: 4px; margin-bottom: 24px; width: fit-content; }
.tab-btn { background: none; border: none; color: var(--muted); font-size: 13px; font-weight: 600; padding: 8px 18px; border-radius: 7px; cursor: pointer; transition: all .2s; }
.tab-btn.active { background: var(--accent); color: #fff; }
.tab-btn:not(.active):hover { color: var(--text); background: rgba(255,255,255,.05); }
.tab-content { display: block; }
.tab-content.hidden { display: none; }

/* Builder Grid */
.builder-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 16px; margin-bottom: 24px; }

/* Field Cards */
.field-card { background: var(--card); border: 1px solid var(--border); border-radius: 12px; padding: 18px; }
.field-header { display: flex; align-items: center; gap: 10px; margin-bottom: 14px; }
.field-icon { font-size: 22px; }
.field-header h3 { font-size: 14px; font-weight: 700; margin: 0; }
.field-range { font-size: 11px; color: var(--muted); display: block; }
.field-preview { font-family: var(--mono); font-size: 15px; font-weight: 800; color: var(--accent2); background: rgba(99,102,241,.1); padding: 4px 10px; border-radius: 5px; margin-left: auto; }

.mode-tabs { display: flex; flex-wrap: wrap; gap: 4px; margin-bottom: 12px; }
.mode-btn { background: var(--bg2); border: 1px solid var(--border); color: var(--muted); font-size: 11px; font-weight: 600; padding: 4px 10px; border-radius: 5px; cursor: pointer; transition: all .2s; white-space: nowrap; }
.mode-btn.active { background: rgba(99,102,241,.2); border-color: var(--accent); color: var(--accent2); }
.mode-btn:not(.active):hover { border-color: var(--muted); color: var(--text); }

.mode-panel { padding: 4px 0; }
.mode-panel.hidden { display: none; }
.mode-desc { font-size: 12px; color: var(--muted); line-height: 1.5; }
.mode-desc code { font-family: var(--mono); font-size: 12px; background: rgba(99,102,241,.12); color: var(--accent2); padding: 1px 4px; border-radius: 3px; }
label { font-size: 13px; color: var(--text); display: flex; align-items: center; gap: 8px; flex-wrap: wrap; margin-top: 6px; }
.step-row { margin-top: 8px; }
.num-input { background: var(--bg); border: 1px solid var(--border); color: var(--text); font-size: 14px; font-weight: 700; font-family: var(--mono); width: 72px; padding: 5px 8px; border-radius: 6px; text-align: center; outline: none; }
.num-input:focus { border-color: var(--accent); }
.num-input-sm { width: 56px; background: var(--bg); border: 1px solid var(--border); color: var(--text); font-size: 14px; font-weight: 700; font-family: var(--mono); padding: 5px 8px; border-radius: 6px; text-align: center; outline: none; }
.select-sm { background: var(--bg); border: 1px solid var(--border); color: var(--text); font-size: 13px; padding: 5px 8px; border-radius: 6px; outline: none; }

/* Chip Grid */
.chip-grid { display: flex; flex-wrap: wrap; gap: 5px; margin-top: 8px; }
.chips-sm .chip { min-width: 32px; }
.chip { min-width: 38px; text-align: center; background: var(--bg); border: 1px solid var(--border); color: var(--muted); font-size: 11px; font-weight: 700; font-family: var(--mono); padding: 4px 6px; border-radius: 5px; cursor: pointer; transition: all .15s; user-select: none; }
.chip.selected { background: rgba(99,102,241,.25); border-color: var(--accent); color: var(--accent2); }
.chip:not(.selected):hover { border-color: var(--muted); color: var(--text); }

/* Next Runs Card */
.runs-card { background: var(--card); border: 1px solid var(--border); border-radius: 12px; padding: 20px; margin-bottom: 24px; }
.runs-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 16px; flex-wrap: wrap; gap: 10px; }
.runs-header h3 { font-size: 15px; font-weight: 700; }
.tz-toggle { display: flex; gap: 4px; }
.tz-btn { background: var(--bg2); border: 1px solid var(--border); color: var(--muted); font-size: 12px; font-weight: 600; padding: 5px 12px; border-radius: 6px; cursor: pointer; transition: all .2s; }
.tz-btn.active { background: var(--accent); border-color: var(--accent); color: #fff; }
.runs-table-wrap { overflow-x: auto; }
.runs-table { width: 100%; border-collapse: collapse; font-size: 13px; }
.runs-table th { background: var(--bg2); color: var(--muted); font-weight: 700; font-size: 11px; text-transform: uppercase; letter-spacing: .5px; padding: 9px 14px; text-align: left; border-bottom: 2px solid var(--border); }
.runs-table td { padding: 9px 14px; border-bottom: 1px solid rgba(51,65,85,.5); font-family: var(--mono); }
.runs-table tr:last-child td { border-bottom: none; }
.runs-table tr:nth-child(1) td { color: var(--green); font-weight: 700; }
.runs-table tr:hover td { background: rgba(255,255,255,.025); }
.runs-table .from-now { color: var(--muted); font-size: 11px; }

/* Decode Tab */
.decode-card { background: var(--card); border: 1px solid var(--border); border-radius: 12px; padding: 24px; margin-bottom: 24px; }
.decode-input-row { display: flex; gap: 10px; margin-bottom: 20px; }
.decode-input { flex: 1; background: var(--bg); border: 1px solid var(--border); color: var(--accent2); font-family: var(--mono); font-size: 16px; font-weight: 700; padding: 12px 16px; border-radius: 8px; outline: none; letter-spacing: 3px; }
.decode-input:focus { border-color: var(--accent); }
.btn-decode { background: var(--accent); border: none; color: #fff; font-size: 14px; font-weight: 700; padding: 12px 20px; border-radius: 8px; cursor: pointer; white-space: nowrap; transition: opacity .2s; }
.btn-decode:hover { opacity: .85; }
.decode-result { font-size: 14px; line-height: 1.7; }
.decode-meaning { font-size: 18px; font-weight: 700; color: #a5b4fc; margin-bottom: 16px; padding: 12px 16px; background: rgba(99,102,241,.08); border-left: 3px solid var(--accent); border-radius: 0 8px 8px 0; }
.decode-fields { display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); gap: 10px; margin-bottom: 20px; }
.decode-field-box { background: var(--bg2); border: 1px solid var(--border); border-radius: 8px; padding: 12px; }
.decode-field-name { font-size: 10px; font-weight: 700; color: var(--muted); text-transform: uppercase; letter-spacing: .5px; margin-bottom: 4px; }
.decode-field-val { font-family: var(--mono); font-size: 15px; font-weight: 700; color: var(--accent2); }
.decode-field-desc { font-size: 11px; color: var(--muted); margin-top: 3px; }
.decode-error { color: var(--danger); font-weight: 600; padding: 12px; background: rgba(248,113,113,.08); border: 1px solid rgba(248,113,113,.25); border-radius: 8px; }
.decode-input-hint { font-size: 12px; color: var(--muted); margin-bottom: 12px; }
.decode-special-badge { display: inline-flex; align-items: center; gap: 6px; background: rgba(16,185,129,.1); border: 1px solid rgba(16,185,129,.3); color: #34d399; font-size: 12px; font-weight: 700; padding: 4px 10px; border-radius: 999px; margin-bottom: 12px; }

/* Presets Grid */
.presets-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 14px; margin-bottom: 24px; }
.preset-card { background: var(--card); border: 1px solid var(--border); border-radius: 10px; padding: 16px; cursor: pointer; transition: all .2s; }
.preset-card:hover { border-color: var(--accent); transform: translateY(-2px); }
.preset-header { display: flex; justify-content: space-between; align-items: flex-start; margin-bottom: 8px; }
.preset-name { font-size: 14px; font-weight: 700; }
.preset-badge { font-size: 10px; font-weight: 700; padding: 2px 6px; border-radius: 4px; }
.badge-sys { background: rgba(6,182,212,.15); color: #22d3ee; }
.badge-web { background: rgba(16,185,129,.15); color: #34d399; }
.badge-ci { background: rgba(249,115,22,.15); color: #fb923c; }
.badge-data { background: rgba(167,139,250,.15); color: #c084fc; }
.preset-expr { font-family: var(--mono); font-size: 16px; font-weight: 800; color: var(--accent2); margin-bottom: 6px; }
.preset-desc { font-size: 12px; color: var(--muted); }
.preset-apply-hint { font-size: 10px; color: #64748b; margin-top: 8px; }

/* Tool Matrix */
.tool-matrix { background: var(--card); border: 1px solid var(--border); border-radius: 12px; padding: 20px; margin-bottom: 24px; text-align: center; }
.matrix-title { font-size: 11px; font-weight: 700; color: var(--muted); text-transform: uppercase; letter-spacing: .5px; display: block; margin-bottom: 14px; }
.matrix-links { display: flex; justify-content: center; gap: 10px; flex-wrap: wrap; }
.matrix-badge { background: var(--bg2); border: 1px solid var(--border); color: var(--text); text-decoration: none; font-size: 12px; padding: 7px 14px; border-radius: 8px; transition: all .2s; display: inline-flex; align-items: center; gap: 5px; }
.matrix-badge:hover { border-color: var(--accent2); color: var(--accent2); transform: translateY(-1px); }

/* Ad */
.ad-wrapper { margin: 20px 0; text-align: center; }
.ad-container { display: inline-block; min-height: 90px; background: rgba(15,23,42,.6); border: 1px solid var(--border); border-radius: 8px; padding: 4px; max-width: 100%; overflow-x: auto; }
.ad-caption { font-size: 11px; color: #475569; margin-top: 6px; }

/* Donation */
.donation-bar { display: flex; align-items: center; justify-content: center; gap: 8px; flex-wrap: wrap; padding: 12px 16px; background: rgba(245,158,11,.08); border: 1px solid rgba(245,158,11,.25); border-radius: 10px; margin-bottom: 30px; font-size: 13px; }
.amazon-link { color: #fbbf24; text-decoration: none; font-weight: 700; }
.amazon-link:hover { text-decoration: underline; }
.btn-copy-email { background: none; border: 1px dashed rgba(251,191,36,.4); color: #fbbf24; font-size: 12px; font-family: var(--mono); padding: 3px 10px; border-radius: 5px; cursor: pointer; }
.btn-copy-email:hover { background: rgba(251,191,36,.1); }

/* Footer */
.footer { text-align: center; padding: 24px 20px; border-top: 1px solid var(--border); color: var(--muted); font-size: 13px; }

/* Toast */
.toast { position: fixed; bottom: 24px; right: 24px; background: var(--green); color: #064e3b; padding: 10px 20px; border-radius: 8px; font-size: 13px; font-weight: 700; box-shadow: 0 8px 24px rgba(0,0,0,.4); opacity: 0; transform: translateY(10px); transition: all .2s; pointer-events: none; z-index: 9999; }
.toast.show { opacity: 1; transform: translateY(0); }

@media (max-width: 640px) {
    .hero h1 { font-size: 24px; }
    .expr-display code { font-size: 22px; letter-spacing: 4px; }
    .expr-fields-label span { width: 60px; font-size: 9px; }
    .tab-bar { width: 100%; flex-wrap: wrap; }
    .tab-btn { flex: 1; font-size: 11px; padding: 7px 6px; }
}