/* ===========================================
   HSE-INSPIRED DARK EXECUTIVE THEME
   Final version — no serif, no italic
   =========================================== */

/* ===========================================
   CSS VARIABLES
   =========================================== */
:root {
    /* Backgrounds */
    --bg-primary: #0a0a0a;
    --bg-card: #111111;
    --bg-card-hover: #161616;
    --bg-elevated: #1a1a1a;
    --border-subtle: rgba(255, 255, 255, 0.06);
    --border-accent: rgba(212, 175, 55, 0.3);

    /* Text */
    --text-primary: #f0ede8;
    --text-secondary: #8a8580;
    --text-muted: #5a5550;

    /* Accent Colors */
    --accent-gold: #d4af37;
    --accent-gold-dim: rgba(212, 175, 55, 0.15);
    --accent-gold-glow: rgba(212, 175, 55, 0.08);
    --accent-green: #39d353;
    --accent-green-dim: rgba(57, 211, 83, 0.12);
    --accent-red: #ff6b6b;
    --accent-red-dim: rgba(255, 107, 107, 0.12);
    --accent-blue: #5b9cf5;
    --accent-blue-dim: rgba(91, 156, 245, 0.12);
    --accent-purple: #a78bfa;
    --accent-purple-dim: rgba(167, 139, 250, 0.12);
    --accent-orange: #f59e0b;
    --accent-orange-dim: rgba(245, 158, 11, 0.12);
    --accent-cyan: #22d3ee;
    --accent-cyan-dim: rgba(34, 211, 238, 0.12);

    /* Typography */
    --font-display: 'Manrope', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
    --title-size: clamp(2rem, 5vw, 3.8rem);
    --h2-size: clamp(1.4rem, 3.5vw, 2.4rem);
    --h3-size: clamp(1rem, 2vw, 1.3rem);
    --body-size: clamp(0.8rem, 1.4vw, 1.05rem);
    --small-size: clamp(0.65rem, 1vw, 0.85rem);
    --mono-size: clamp(0.65rem, 1vw, 0.8rem);

    /* Spacing */
    --content-gap: clamp(0.75rem, 2vw, 2rem);
}

/* ===========================================
   FONTS
   Import via HTML <head>:
   <link href="https://fonts.googleapis.com/css2?family=Manrope:wght@300;400;500;600;700;800&family=JetBrains+Mono:wght@400;500;600&display=swap" rel="stylesheet">
   =========================================== */

/* ===========================================
   TYPOGRAPHY
   =========================================== */
h1 {
    font-size: var(--title-size);
    font-weight: 800;
    line-height: 1.05;
    letter-spacing: -0.03em;
    color: var(--text-primary);
}

h1 .accent {
    color: var(--accent-gold);
}

/* Gold emphasis for key words — no italic */
.em {
    color: var(--accent-gold);
}

h2 {
    font-size: var(--h2-size);
    font-weight: 700;
    line-height: 1.15;
    letter-spacing: -0.02em;
    color: var(--text-primary);
    margin-bottom: var(--content-gap);
}

h3 {
    font-size: var(--h3-size);
    font-weight: 600;
    line-height: 1.3;
    color: var(--text-primary);
}

p, li {
    font-size: var(--body-size);
    line-height: 1.6;
    color: var(--text-secondary);
    font-weight: 400;
}

.subtitle {
    font-size: clamp(0.9rem, 1.8vw, 1.2rem);
    color: var(--text-secondary);
    font-weight: 400;
    line-height: 1.5;
    max-width: 600px;
}

/* ===========================================
   TAGS & BADGES
   =========================================== */
.tag {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: var(--small-size);
    color: var(--accent-gold);
    text-transform: uppercase;
    letter-spacing: 0.15em;
    padding: 0.35em 0.8em;
    border: 1px solid var(--border-accent);
    border-radius: 2px;
    margin-bottom: 1em;
    background: var(--accent-gold-dim);
    width: fit-content;
}

.signal-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5em;
    font-family: var(--font-mono);
    font-size: var(--small-size);
    padding: 0.3em 0.7em;
    border-radius: 4px;
    font-weight: 500;
    letter-spacing: 0.05em;
}

.signal-badge.gold   { background: var(--accent-gold-dim);   color: var(--accent-gold); }
.signal-badge.green  { background: var(--accent-green-dim);  color: var(--accent-green); }
.signal-badge.blue   { background: var(--accent-blue-dim);   color: var(--accent-blue); }
.signal-badge.purple { background: var(--accent-purple-dim); color: var(--accent-purple); }
.signal-badge.orange { background: var(--accent-orange-dim); color: var(--accent-orange); }
.signal-badge.red    { background: var(--accent-red-dim);    color: var(--accent-red); }
.signal-badge.cyan   { background: var(--accent-cyan-dim);   color: var(--accent-cyan); }

/* ===========================================
   CARDS & GRIDS
   =========================================== */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: 8px;
    padding: clamp(1rem, 2vw, 1.5rem);
    transition: border-color 0.3s ease, background 0.3s ease;
}

.card:hover {
    border-color: var(--border-accent);
    background: var(--bg-card-hover);
}

.card h3 { margin-bottom: 0.4em; }
.card p  { font-size: var(--small-size); color: var(--text-muted); line-height: 1.5; }

.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: clamp(0.75rem, 1.5vw, 1.25rem); }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: clamp(0.75rem, 1.5vw, 1.25rem); }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: clamp(0.75rem, 1.5vw, 1.25rem); }

/* ===========================================
   CODE BLOCKS
   =========================================== */
.code-block {
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: 6px;
    padding: clamp(0.75rem, 1.5vw, 1.25rem);
    font-family: var(--font-mono);
    font-size: var(--mono-size);
    line-height: 1.7;
    color: var(--text-secondary);
    overflow: hidden;
}

.code-block .key     { color: var(--accent-gold); }
.code-block .val     { color: var(--accent-green); }
.code-block .comment { color: var(--text-muted); }

/* ===========================================
   KPI BOXES
   =========================================== */
.kpi-row {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: clamp(0.75rem, 1.5vw, 1.25rem);
}

.kpi {
    text-align: center;
    padding: clamp(1rem, 2vw, 1.5rem);
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: 8px;
}

.kpi-value {
    font-size: clamp(1.5rem, 3.5vw, 2.5rem);
    font-weight: 800;
    color: var(--accent-gold);
    line-height: 1.1;
    margin-bottom: 0.2em;
}

.kpi-label {
    font-size: var(--small-size);
    color: var(--text-muted);
    font-weight: 500;
}

/* ===========================================
   TIMELINE
   =========================================== */
.timeline {
    display: flex;
    flex-direction: column;
    gap: clamp(0.4rem, 1vw, 0.75rem);
}

.timeline-item {
    display: flex;
    align-items: center;
    gap: clamp(0.75rem, 1.5vw, 1.25rem);
    padding: clamp(0.6rem, 1vw, 0.9rem) clamp(0.8rem, 1.5vw, 1.25rem);
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: 6px;
}

.timeline-time {
    font-family: var(--font-mono);
    font-size: var(--small-size);
    color: var(--accent-gold);
    min-width: 5em;
    font-weight: 600;
}

/* ===========================================
   FLOW ARROWS
   =========================================== */
.flow-row {
    display: flex;
    align-items: center;
    gap: clamp(0.5rem, 1.5vw, 1.25rem);
}

.flow-arrow {
    color: var(--text-muted);
    font-size: clamp(1rem, 1.5vw, 1.3rem);
    flex-shrink: 0;
}

.flow-box {
    flex: 1;
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: 6px;
    padding: clamp(0.6rem, 1.2vw, 1rem) clamp(0.8rem, 1.5vw, 1.25rem);
    text-align: center;
}

.flow-box h3 {
    font-size: var(--small-size);
    font-family: var(--font-mono);
    color: var(--accent-gold);
    margin-bottom: 0.25em;
}

.flow-box p {
    font-size: var(--small-size);
    color: var(--text-muted);
}

/* ===========================================
   RULE LISTS
   =========================================== */
.rule-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: clamp(0.4rem, 0.8vw, 0.6rem);
}

.rule-list li {
    display: flex;
    align-items: flex-start;
    gap: 0.75em;
    font-size: var(--body-size);
    color: var(--text-secondary);
}

.rule-list li::before       { content: '—'; color: var(--accent-gold); font-weight: 700; flex-shrink: 0; }
.rule-list.do li::before    { content: '✓'; color: var(--accent-green); }
.rule-list.dont li::before  { content: '✕'; color: var(--accent-red); }

/* ===========================================
   TWO COLUMNS
   =========================================== */
.two-col {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: clamp(1.5rem, 3vw, 3rem);
    align-items: start;
}

.col-label {
    font-family: var(--font-mono);
    font-size: var(--small-size);
    text-transform: uppercase;
    letter-spacing: 0.15em;
    margin-bottom: 0.75em;
    font-weight: 600;
}

.col-label.green { color: var(--accent-green); }
.col-label.red   { color: var(--accent-red); }

/* ===========================================
   DIVIDER
   =========================================== */
.divider {
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--border-accent), transparent);
    margin: var(--content-gap) 0;
}

/* ===========================================
   MONO LABELS
   =========================================== */
.slide-number {
    font-family: var(--font-mono);
    font-size: var(--small-size);
    color: var(--accent-gold);
    letter-spacing: 0.1em;
    font-weight: 500;
}

.slide-label {
    font-family: var(--font-mono);
    font-size: var(--small-size);
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.15em;
}

/* ===========================================
   RESPONSIVE
   =========================================== */
@media (max-width: 768px) {
    .grid-2, .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
    .two-col { grid-template-columns: 1fr; }
    .kpi-row { grid-template-columns: repeat(2, 1fr); }
    .flow-row { flex-direction: column; }
    .flow-arrow { transform: rotate(90deg); }
}

@media (max-width: 500px) {
    .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        transition-duration: 0.2s !important;
    }
}
