@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;700;800;900&family=JetBrains+Mono:wght@400;700&display=swap');

:root {
    --bg: #020617;
    --panel: rgba(15, 23, 42, 0.75);
    --border: rgba(255, 255, 255, 0.08);
    --purple: #a855f7;
    --purple-lt: #c084fc;
    --purple-glow: rgba(168, 85, 247, 0.15);
    --gold: #f59e0b;
    --teal: #06b6d4;
    --green: #10b981;
    --red: #ef4444;
    --blue: #3b82f6;
    --text: #f1f5f9;
    --muted: #94a3b8;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body.sim-page {
    font-family: 'Outfit', sans-serif;
    color: var(--text);
    margin: 0;
    padding: 0;
    overflow: hidden;
    background: #020617;
    touch-action: none;
    overscroll-behavior: none;
}

#phet-stage {
    position: absolute;
    top: 0;
    left: 0;
    width: 1280px;
    height: 720px;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    background: var(--bg);
    transform-origin: top left;
}

/* NAV */
.sim-nav {
    position: relative !important;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.35rem 1rem;
    background: rgba(15, 23, 42, 0.92);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    z-index: 200;
}

.nav-left {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.sim-logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: #f1f5f9;
    font-size: 1.15rem;
    font-weight: 700;
}

.logo-icon {
    font-size: 1.4rem;
    color: var(--purple);
}

.logo-thin {
    font-weight: 300;
}

.nav-breadcrumbs {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 0.85rem;
    color: var(--muted);
}

.nav-breadcrumbs a {
    color: var(--muted);
    text-decoration: none;
    transition: color 0.2s;
}

.nav-breadcrumbs a:hover {
    color: var(--purple);
}

.nav-breadcrumbs .sep {
    font-weight: 300;
    color: #334155;
}

.nav-breadcrumbs .current {
    font-weight: 600;
    color: var(--purple);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.nav-right {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.nav-back {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.4rem 1rem;
    background: rgba(255, 255, 255, 0.05);
    color: #f1f5f9;
    text-decoration: none;
    border-radius: 8px;
    font-size: 0.85rem;
    font-weight: 600;
    transition: all 0.2s;
    border: 1px solid var(--border);
}

.nav-back:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-1px);
}

/* MAIN CONTENT */
.coord-main {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: 0.4rem 0.6rem;
    gap: 0.35rem;
    overflow: hidden;
}

/* COMPLEX SELECTOR */
.complex-selector-wrap {
    background: var(--panel);
    backdrop-filter: blur(12px);
    border: 1px solid var(--border);
    border-radius: 13px;
    padding: 0.5rem 1rem;
    display: flex;
    align-items: center;
    gap: 0.8rem;
}

.cs-label {
    font-size: 0.65rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--muted);
    flex-shrink: 0;
}

.complex-pills {
    display: flex;
    gap: 0.4rem;
    overflow-x: auto;
    padding-bottom: 4px;
    flex: 1;
}

.complex-pills::-webkit-scrollbar { height: 3px; }
.complex-pills::-webkit-scrollbar-thumb { background: rgba(168, 85, 247, 0.3); border-radius: 10px; }

.complex-pill {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border);
    border-radius: 30px;
    padding: 0.28rem 0.75rem;
    font-family: inherit;
    font-size: 0.7rem;
    font-weight: 700;
    color: var(--muted);
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    gap: 0.45rem;
}

.complex-pill:hover {
    border-color: var(--purple);
    color: var(--purple-lt);
}

.complex-pill.active {
    background: rgba(168, 85, 247, 0.15);
    border-color: var(--purple);
    color: var(--purple-lt);
}

/* TOP BAR & TABS */
.top-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    margin-bottom: -0.2rem;
}

.top-bar h1 {
    font-size: 1.15rem;
    font-weight: 800;
}

.geom-badge {
    padding: 0.22rem 0.75rem; border-radius: 20px; font-size: 0.72rem; font-weight: 700;
    background: rgba(168, 85, 247, 0.12); border: 1px solid rgba(168, 85, 247, 0.3); color: var(--purple-lt);
    font-family: 'JetBrains Mono', monospace;
}

.phase-badge {
    padding: 0.22rem 0.75rem; border-radius: 20px; font-size: 0.72rem; font-weight: 700;
    background: rgba(245, 158, 11, 0.1); border: 1px solid rgba(245, 158, 11, 0.3); color: var(--gold);
}

.tab-row {
    display: flex;
    gap: 0.4rem;
    background: rgba(15, 23, 42, 0.4);
    border: 1px solid var(--border);
    padding: 0.25rem;
    border-radius: 10px;
}

.tab-btn {
    background: transparent;
    border: 1px solid transparent;
    color: var(--muted);
    padding: 0.45rem 1.1rem;
    border-radius: 9px;
    font-size: 0.78rem;
    font-weight: 700;
    cursor: pointer;
    transition: 0.2s;
    display: flex;
    align-items: center;
    gap: 0.4rem;
    font-family: inherit;
}

.tab-btn:hover {
    color: var(--purple-lt);
}

.tab-btn.active {
    background: rgba(168, 85, 247, 0.15);
    color: var(--purple-lt);
    border-color: rgba(168, 85, 247, 0.3);
}

.coord-layout {
    flex: 1;
    display: flex;
    flex-direction: row;
    gap: 0.5rem;
    overflow: hidden;
    align-items: stretch;
}

.left-panel {
    width: 220px;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    overflow-y: auto;
    padding-right: 4px;
    min-height: 0;
    flex-shrink: 0;
}

.right-panel {
    width: 230px;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    overflow-y: auto;
    padding-right: 4px;
    min-height: 0;
    flex-shrink: 0;
}

.center-panel {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    min-width: 0;
}

.panel-box {
    background: var(--panel);
    backdrop-filter: blur(16px);
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 1rem;
}

.panel-title {
    font-size: 0.62rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--muted);
    margin-bottom: 0.75rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* METAL CARD */
.metal-card {
    border-radius: 12px;
    padding: 0.9rem;
    text-align: center;
    border: 1px solid rgba(168, 85, 247, 0.2);
    background: rgba(168, 85, 247, 0.05);
    margin-bottom: 0.55rem;
    position: relative;
    overflow: hidden;
}

.metal-symbol {
    font-size: 2.2rem;
    font-weight: 900;
    font-family: 'JetBrains Mono', monospace;
    color: var(--purple-lt);
    line-height: 1;
}

.metal-name-row {
    font-size: 0.7rem;
    color: var(--muted);
    margin: 0.25rem 0 0.55rem;
}

.metal-props {
    display: flex;
    flex-direction: column;
    gap: 0.22rem;
}

.mprop {
    display: flex;
    justify-content: space-between;
    font-size: 0.7rem;
}

.mlbl {
    color: var(--muted);
}

.mval {
    font-weight: 700;
    font-family: 'JetBrains Mono', monospace;
}

.config-display {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.7rem;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 0.4rem 0.65rem;
    color: #94a3b8;
    margin-top: 0.35rem;
    text-align: center;
}

/* CANVAS VIEW */
.canvas-wrap {
    flex: 1;
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--border);
    border-radius: 16px;
    overflow: hidden;
    position: relative;
    cursor: grab;
    user-select: none;
}

.canvas-wrap:active { cursor: grabbing; }

#simCanvas {
    width: 100%;
    height: 100%;
    display: block;
}

.canvas-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 0.3rem;
}

.canvas-title {
    font-size: 1rem;
    font-weight: 800;
}

/* CONTROLS */
.controls-row {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    margin-top: 0.2rem;
}

.ctrl-btn {
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--border);
    color: var(--muted);
    padding: 0.38rem 0.9rem;
    border-radius: 8px;
    font-size: 0.72rem;
    font-weight: 700;
    cursor: pointer;
    transition: 0.2s;
    display: flex;
    align-items: center;
    gap: 0.4rem;
    font-family: inherit;
}

.ctrl-btn:hover {
    border-color: var(--purple);
    color: var(--purple);
}

.ctrl-btn.active {
    background: rgba(168, 85, 247, 0.12);
    border-color: rgba(168, 85, 247, 0.35);
    color: var(--purple);
}

.ctrl-btn.primary-btn {
    background: rgba(168, 85, 247, 0.15);
    border-color: rgba(168, 85, 247, 0.4);
    color: var(--purple-lt);
}

.ctrl-btn.primary-btn:hover { background: var(--purple); color: #07030f; }

.fact-bar {
    background: linear-gradient(135deg, rgba(168, 85, 247, 0.1), transparent);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 0.65rem 1rem;
    display: flex;
    align-items: flex-start;
    gap: 0.7rem;
    margin-top: 0.5rem;
}

.fact-icon {
    font-size: 1.35rem;
    flex-shrink: 0;
}

.fact-text {
    font-size: 0.75rem;
    color: var(--muted);
    line-height: 1.6;
}

/* IUPAC BOXES */
.iupac-box {
    background: rgba(245, 158, 11, 0.06);
    border: 1px solid rgba(245, 158, 11, 0.25);
    border-radius: 10px;
    padding: 0.6rem 0.8rem;
    margin-bottom: 0.5rem;
}

.iupac-label {
    font-size: 0.6rem;
    font-weight: 800;
    text-transform: uppercase;
    color: var(--gold);
    margin-bottom: 0.22rem;
}

.iupac-formula, .iupac-name {
    font-size: 0.78rem;
    color: #fde68a;
    font-weight: 700;
}

.iupac-formula {
    font-family: 'JetBrains Mono', monospace;
}

/* ISOMER BOX */
.isomer-tag {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    padding: 0.18rem 0.6rem;
    border-radius: 20px;
    font-size: 0.65rem;
    font-weight: 700;
    margin-right: 0.3rem;
    margin-bottom: 0.3rem;
}

.isomer-tag.geo { background: rgba(6, 182, 212, 0.12); color: var(--teal); border: 1px solid rgba(6, 182, 212, 0.3); }
.isomer-tag.optical { background: rgba(245, 158, 11, 0.12); color: var(--gold); border: 1px solid rgba(245, 158, 11, 0.3); }
.isomer-tag.linkage { background: rgba(239, 68, 68, 0.12); border: 1px solid rgba(239, 68, 68, 0.3); color: var(--red); }
.isomer-tag.ionisation { background: rgba(16, 185, 129, 0.12); border: 1px solid rgba(16, 185, 129, 0.3); color: var(--green); }

.highlight-box {
    background: rgba(168, 85, 247, 0.07);
    border-left: 3px solid var(--purple);
    border-radius: 7px;
    padding: 0.6rem 0.8rem;
    font-size: 0.72rem;
    color: #c4b5fd;
    line-height: 1.6;
    margin-top: 0.5rem;
}

/* SCROLLBAR */
::-webkit-scrollbar { width: 5px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.1); border-radius: 10px; }

/* MODALS */
.modal-overlay {
    position: fixed; inset: 0;
    background: rgba(2, 6, 23, 0.9);
    backdrop-filter: blur(12px);
    z-index: 1000;
    display: flex; align-items: center; justify-content: center;
    padding: 2rem;
}

.modal-overlay.hidden { display: none; }

.modal-box {
    background: linear-gradient(145deg, #0d0520, #07030f);
    border: 1px solid rgba(168, 85, 247, 0.25);
    border-radius: 22px;
    padding: 1.6rem;
    width: 100%;
    max-width: 660px;
    max-height: 88vh;
    overflow-y: auto;
    position: relative;
    box-shadow: 0 35px 90px rgba(0, 0, 0, 0.8);
}

.modal-close {
    position: absolute; top: 0.9rem; right: 0.9rem;
    background: rgba(255, 255, 255, 0.05); border: 1px solid var(--border);
    color: var(--muted); width: 30px; height: 30px; border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    cursor: pointer; font-size: 0.8rem;
}

.modal-close:hover { background: var(--red); color: #fff; border-color: var(--red); }


/* Layout is fixed by Scaling Engine */