/* ─────────────────────────────────────────────────────────────
   quadraticUpgrade3Styles.css
   TNT | JavaQuadraticSaga2026-09-14 | Upgrade 3 Showcase
   Follows the Upgrade 2 showcase pattern with a violet / purple
   accent shift to mark the roots-constructor milestone.
──────────────────────────────────────────────────────────────── */

:root {
    --q3-violet:      #5b21b6;
    --q3-violet-md:   #7c3aed;
    --q3-violet-lt:   #a78bfa;
    --q3-violet-pale: #ede9fe;
    --q3-gold:        #C8941A;
    --q3-gold-lt:     #e8b84f;
    --q3-navy:        #0a0e1a;
    --q3-dark-bg:     #0d0814;
    --q3-mid-bg:      #0e0b1e;

    /* Greenbar paper */
    --gb-row-a:       #f4efff;
    --gb-row-b:       #e7ddff;
    --gb-num-color:   #7a67b9;
    --gb-border:      #c8b6ff;

    /* Java syntax */
    --java-keyword:   #8b0000;
    --java-type:      #00439c;
    --java-string:    #006400;
    --java-comment:   #6a737d;
    --java-annot:     #9a3e00;
    --java-number:    #0052cc;
}

/* ── Hero ─────────────────────────────────────────────────── */
#hero {
    min-height: 36vh;
    background:
        linear-gradient(135deg, rgba(13,8,20,0.90) 0%, rgba(91,33,182,0.55) 100%),
        url('../../images/scarecrowBrain.jpg') center 40% / cover no-repeat;
    background-color: var(--q3-dark-bg);
    display: flex;
    align-items: center;
    padding: 4rem 1rem 3rem;
    color: #fff;
    text-align: center;
}

.hero-content { max-width: 820px; margin: 0 auto; }

.hero-eyebrow {
    font-size: 0.74rem;
    letter-spacing: 3px;
    text-transform: uppercase;
    color: rgba(255,255,255,0.50);
    display: block;
    margin-bottom: 0.7rem;
}

.hero-title {
    font-family: 'Boogaloo', cursive;
    font-size: clamp(2.2rem, 5.5vw, 3.4rem);
    line-height: 1.12;
    margin-bottom: 0.8rem;
}

.hero-subtitle {
    font-size: clamp(0.9rem, 2vw, 1.05rem);
    color: rgba(255,255,255,0.76);
    line-height: 1.68;
    max-width: 760px;
    margin: 0 auto 1.5rem;
}

/* ── Spark / mini-nav bar ─────────────────────────────────── */
.spark-bar {
    background: var(--q3-navy);
    padding: 0.52rem 1.2rem;
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 1.2rem;
    border-bottom: 2px solid var(--q3-violet);
    font-size: 0.88rem;
}

.spark-links { display: flex; gap: 1.2rem; align-items: center; flex-wrap: wrap; }
.spark-links a { color: var(--q3-gold); font-weight: 700; text-decoration: none; }
.spark-links a:hover { color: #fff; text-decoration: underline; }
.spark-bar > span { color: rgba(255,255,255,0.35); font-size: 0.80rem; margin-left: auto; }

/* ── Intro section ────────────────────────────────────────── */
#introSection {
    background: #f4f5f7;
    padding: 3.5rem 0 3rem;
}

.intro-card {
    background: #fff;
    border: 1.5px solid #e3ddf3;
    border-top: 5px solid var(--q3-violet);
    border-radius: 14px;
    padding: 1.75rem 2rem;
    box-shadow: 0 3px 16px rgba(0,0,0,0.07);
}

.intro-card h2 {
    font-family: 'Boogaloo', cursive;
    font-size: clamp(1.5rem, 3.5vw, 2rem);
    color: #0a0e1a;
    margin-bottom: 0.75rem;
}

.intro-card p {
    font-size: 0.93rem;
    color: #444;
    line-height: 1.75;
}

.changed-list {
    padding-left: 1.2rem;
    font-size: 0.885rem;
    color: #444;
    line-height: 1.8;
}

.changed-list li::marker { color: var(--q3-violet); font-weight: 700; }

.upgrade-badge {
    display: inline-block;
    background: var(--q3-violet);
    color: #fff;
    font-size: 0.70rem;
    font-weight: 700;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    padding: 0.2rem 0.8rem;
    border-radius: 50px;
    margin-bottom: 0.7rem;
}

.unchanged-badge {
    display: inline-block;
    background: #555;
    color: #fff;
    font-size: 0.65rem;
    font-weight: 700;
    letter-spacing: 1px;
    text-transform: uppercase;
    padding: 0.15rem 0.65rem;
    border-radius: 50px;
    margin-left: 0.5rem;
    vertical-align: middle;
}

/* ── File showcase sections ───────────────────────────────── */
.file-section { padding: 3.5rem 0 2.5rem; }
.file-section:nth-child(odd)  { background: var(--q3-dark-bg); color: #fff; }
.file-section:nth-child(even) { background: var(--q3-mid-bg);  color: #fff; }

.file-section-label {
    font-size: 0.70rem;
    letter-spacing: 3px;
    text-transform: uppercase;
    font-weight: 700;
    color: var(--q3-gold);
    margin-bottom: 0.35rem;
}

.file-section-title {
    font-family: 'Boogaloo', cursive;
    font-size: clamp(1.5rem, 3.5vw, 2.2rem);
    color: #fff;
    margin-bottom: 0.75rem;
}

.file-section-sub {
    font-size: 0.875rem;
    color: rgba(255,255,255,0.56);
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

/* ── What-changed card ────────────────────────────────────── */
.changes-card {
    background: rgba(91,33,182,0.18);
    border: 1.5px solid rgba(124,58,237,0.42);
    border-radius: 10px;
    padding: 1.1rem 1.4rem;
    margin-bottom: 1.25rem;
}

.changes-card h3 {
    font-family: 'Boogaloo', cursive;
    font-size: 1.05rem;
    color: var(--q3-gold-lt);
    margin-bottom: 0.4rem;
}

.changes-card ul {
    padding-left: 1.1rem;
    font-size: 0.84rem;
    color: rgba(255,255,255,0.78);
    line-height: 1.75;
    margin: 0;
}

.changes-card ul li::marker { color: var(--q3-gold); }

.alias-warn {
    background: rgba(200,30,30,0.15);
    border: 1.5px solid rgba(200,30,30,0.40);
    border-radius: 8px;
    padding: 0.6rem 1rem;
    margin-top: 0.5rem;
    font-size: 0.84rem;
    color: #ffa0a0;
    line-height: 1.65;
}

.alias-warn strong { color: #ff7070; }

.roots-card {
    background: rgba(237,233,254,0.10);
    border: 1.5px solid rgba(167,139,250,0.45);
    border-left: 5px solid var(--q3-violet-lt);
    border-radius: 0 10px 10px 0;
    padding: 1rem 1.2rem;
    margin: 0 0 1.25rem;
    color: rgba(255,255,255,0.84);
    font-size: 0.855rem;
    line-height: 1.72;
}

.roots-card strong {
    color: #d8c8ff;
    letter-spacing: 1px;
}

.roots-card code {
    color: #f6d365;
    background: rgba(0,0,0,0.18);
    padding: 0.1rem 0.35rem;
    border-radius: 4px;
}

/* ── Code terminal ────────────────────────────────────────── */
.code-terminal-header {
    background: #1c2033;
    padding: 0.6rem 1rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    border-radius: 10px 10px 0 0;
}

.terminal-dots { display: flex; gap: 0.4rem; align-items: center; }
.td { width: 12px; height: 12px; border-radius: 50%; }
.td-red    { background: #ff5f57; }
.td-yellow { background: #febc2e; }
.td-green  { background: #28c840; }

.terminal-filename {
    font-family: 'Source Code Pro', monospace;
    font-size: 0.82rem;
    color: rgba(255,255,255,0.70);
    flex: 1;
}

.terminal-tag {
    font-size: 0.70rem;
    color: rgba(255,255,255,0.38);
    letter-spacing: 0.5px;
}

/* ── Greenbar code paper ──────────────────────────────────── */
.code-paper {
    background: var(--gb-row-a);
    border: 1.5px solid var(--gb-border);
    border-top: none;
    border-radius: 0 0 10px 10px;
    overflow-x: auto;
    max-height: 520px;
    overflow-y: auto;
}

.code-paper ol {
    margin: 0;
    padding: 0;
    list-style-type: decimal;
    padding-left: 3.4rem;
    font-family: 'Source Code Pro', 'Courier New', monospace;
    font-size: 0.80rem;
    line-height: 1.65;
}

.code-paper ol li {
    padding: 0 0.8rem 0 0.4rem;
    white-space: pre;
    position: relative;
}

.code-paper ol li:nth-child(even) { background: var(--gb-row-b); }

.code-paper ol li code {
    font-family: inherit;
    font-size: inherit;
    background: none;
    padding: 0;
    color: #101830;
    white-space: pre;
}

.code-paper ol li::marker {
    color: var(--gb-num-color);
    font-size: 0.70rem;
}

/* ── Java syntax highlighting ─────────────────────────────── */
.java-keyword  { color: var(--java-keyword); font-weight: 700; }
.java-type     { color: var(--java-type); }
.java-string   { color: var(--java-string); }
.java-comment  { color: var(--java-comment); font-style: italic; }
.java-annot    { color: var(--java-annot); font-weight: 600; }
.java-number   { color: var(--java-number); }

/* ── Copy button ──────────────────────────────────────────── */
.copy-btn {
    background: rgba(255,255,255,0.10);
    border: 1px solid rgba(255,255,255,0.25);
    color: rgba(255,255,255,0.60);
    border-radius: 5px;
    padding: 0.18rem 0.65rem;
    font-size: 0.70rem;
    cursor: pointer;
    font-family: inherit;
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    transition: background 0.18s, color 0.18s, border-color 0.18s;
}

.copy-btn:hover {
    background: rgba(255,255,255,0.18);
    color: #fff;
    border-color: rgba(255,255,255,0.50);
}

/* ── Cross-links footer bar ───────────────────────────────── */
.cross-link-bar {
    background: #171022;
    padding: 2rem 0;
    border-top: 1px solid rgba(255,255,255,0.07);
}

.cross-link-bar .btn-group-links {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    justify-content: center;
}

.btn-cross {
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    padding: 0.5rem 1.3rem;
    border-radius: 50px;
    font-size: 0.875rem;
    font-weight: 600;
    text-decoration: none;
    transition: background 0.18s, transform 0.12s;
    border: 1.5px solid;
}

.btn-cross:hover { transform: translateY(-2px); text-decoration: none; }
.btn-cross.primary { background: var(--q3-violet); border-color: var(--q3-violet); color: #fff; }
.btn-cross.primary:hover { background: var(--q3-violet-md); border-color: var(--q3-violet-md); color: #fff; }
.btn-cross.outline-gold { border-color: rgba(200,148,26,0.55); color: var(--q3-gold); }
.btn-cross.outline-gold:hover { background: rgba(200,148,26,0.12); color: var(--q3-gold); }
.btn-cross.outline-green { border-color: rgba(45,90,27,0.65); color: #7ac464; }
.btn-cross.outline-green:hover { background: rgba(45,90,27,0.14); color: #7ac464; }
.btn-cross.outline-white { border-color: rgba(255,255,255,0.30); color: rgba(255,255,255,0.75); }
.btn-cross.outline-white:hover { background: rgba(255,255,255,0.08); color: #fff; }