/* =========================================================================
   PERC Engage — "Connected Futures" Showcase
   Brand palette (from percengage.com globals.css):
     Navy   #1a1a2e     Blue   #034292     Orange #f15d21
     Purple #680154     White  #ffffff
   ========================================================================= */

:root {
    --perc-blue: #034292;
    --perc-orange: #f15d21;
    --perc-purple: #680154;
    --navy: #1a1a2e;
    --bg: #07070f;

    --text: #ffffff;
    --text-dim: rgba(255, 255, 255, 0.66);
    --text-faint: rgba(255, 255, 255, 0.4);

    --glass-bg: rgba(10, 14, 30, 0.42);
    --glass-border: rgba(255, 255, 255, 0.1);
    --glass-border-strong: rgba(241, 93, 33, 0.35);

    --glow-orange: 0 0 24px rgba(241, 93, 33, 0.45);
    --glow-blue: 0 0 24px rgba(74, 163, 255, 0.4);

    --ease: cubic-bezier(0.22, 1, 0.36, 1);
    --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

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

html, body {
    width: 100%;
    height: 100%;
    overflow: hidden;
    background: var(--bg);
    color: var(--text);
    font-family: var(--font);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Subtle brand-tinted ambient gradient behind the canvas (in case of load gap) */
body::before {
    content: '';
    position: fixed;
    inset: 0;
    background:
        radial-gradient(ellipse at 20% 110%, rgba(241, 93, 33, 0.18), transparent 55%),
        radial-gradient(ellipse at 80% -10%, rgba(3, 66, 146, 0.45), transparent 55%),
        linear-gradient(135deg, #05060d 0%, #0a1430 100%);
    z-index: 0;
}

#webgl-canvas {
    position: fixed;
    inset: 0;
    width: 100vw;
    height: 100vh;
    z-index: 1;
    display: block;
}

/* =========================================================================
   LOADING SCREEN
   ========================================================================= */
.loading {
    position: fixed;
    inset: 0;
    z-index: 1000;
    background: linear-gradient(135deg, #05060d 0%, #0a1430 100%);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 28px;
    transition: opacity 0.7s var(--ease);
}
.loading.loaded { opacity: 0; pointer-events: none; }

.loading-logo img {
    width: 280px;
    max-width: 60vw;
    opacity: 0.95;
    animation: logo-breathe 2.4s var(--ease) infinite;
}
@keyframes logo-breathe {
    0%, 100% { opacity: 0.7; filter: drop-shadow(0 0 12px rgba(241,93,33,0.3)); }
    50%      { opacity: 1;   filter: drop-shadow(0 0 28px rgba(241,93,33,0.6)); }
}

.loading-bar {
    width: 240px;
    max-width: 60vw;
    height: 2px;
    background: rgba(255,255,255,0.1);
    border-radius: 2px;
    overflow: hidden;
}
.loading-bar-fill {
    height: 100%;
    width: 40%;
    background: linear-gradient(90deg, var(--perc-blue), var(--perc-orange));
    border-radius: 2px;
    animation: loading-slide 1.6s var(--ease) infinite;
}
@keyframes loading-slide {
    0%   { transform: translateX(-100%); }
    100% { transform: translateX(350%); }
}

.loading p {
    font-size: 0.85rem;
    letter-spacing: 0.3em;
    text-transform: uppercase;
    color: var(--text-dim);
    font-weight: 300;
}

/* =========================================================================
   TOP BAR
   ========================================================================= */
.top-bar {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 30;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 26px 40px;
    pointer-events: none;
}
.brand-logo {
    height: 30px;
    width: auto;
    opacity: 0;
    animation: fade-down 1.2s var(--ease) 0.6s forwards;
    filter: drop-shadow(0 2px 12px rgba(0,0,0,0.5));
}
.top-meta {
    display: flex;
    gap: 10px;
    opacity: 0;
    animation: fade-down 1.2s var(--ease) 0.9s forwards;
}
.meta-pill {
    font-size: 0.68rem;
    font-weight: 500;
    letter-spacing: 0.08em;
    padding: 6px 12px;
    border-radius: 999px;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    color: var(--text-dim);
    white-space: nowrap;
}
.meta-pill:first-child { color: var(--perc-orange); border-color: var(--glass-border-strong); }

@keyframes fade-down {
    from { opacity: 0; transform: translateY(-12px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* =========================================================================
   TEXT OVERLAY
   ========================================================================= */
.text-overlay {
    position: fixed;
    top: 0; left: 0;
    width: 100%;
    height: 100%;
    z-index: 10;
    display: flex;
    align-items: center;
    justify-content: flex-start;
    pointer-events: none;
    padding: 0 6vw;
}
.text-inner {
    max-width: 560px;
    pointer-events: auto;
}

.section-metric {
    display: inline-block;
    font-size: 0.72rem;
    font-weight: 600;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--perc-orange);
    padding: 7px 14px;
    border: 1px solid var(--glass-border-strong);
    border-radius: 999px;
    background: rgba(241, 93, 33, 0.08);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    margin-bottom: 22px;
    opacity: 0;
    transform: translateY(14px);
    transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}
.section-metric:empty { display: none; }
.section-metric.visible { opacity: 1; transform: translateY(0); }

.headline {
    font-size: clamp(2.6rem, 6.5vw, 5.2rem);
    font-weight: 800;
    line-height: 1.08;
    letter-spacing: -0.025em;
    margin-bottom: 18px;
    padding-bottom: 0.08em;  /* room for descenders (g, y, p) so they aren't clipped */
    background: linear-gradient(180deg, #ffffff 0%, rgba(255,255,255,0.82) 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    opacity: 0;
    transform: translateY(20px);
    filter: blur(12px);
    transition: opacity 0.9s var(--ease), transform 0.9s var(--ease), filter 0.9s var(--ease);
}
.headline.visible {
    opacity: 1;
    transform: translateY(0);
    filter: blur(0);
}

.supporting-text {
    font-size: clamp(1.05rem, 1.9vw, 1.4rem);
    font-weight: 300;
    line-height: 1.45;
    color: var(--text);
    margin-bottom: 10px;
    max-width: 480px;
    opacity: 0;
    transform: translateY(18px);
    filter: blur(10px);
    transition: opacity 0.9s var(--ease) 0.12s, transform 0.9s var(--ease) 0.12s, filter 0.9s var(--ease) 0.12s;
}
.supporting-text.visible {
    opacity: 1;
    transform: translateY(0);
    filter: blur(0);
}

.subtext {
    font-size: 0.95rem;
    font-weight: 300;
    line-height: 1.5;
    color: var(--text-dim);
    max-width: 460px;
    opacity: 0;
    transform: translateY(14px);
    transition: opacity 0.8s var(--ease) 0.24s, transform 0.8s var(--ease) 0.24s;
}
.subtext:empty { display: none; }
.subtext.visible { opacity: 1; transform: translateY(0); }

/* CTA button */
.cta-button {
    margin-top: 30px;
    display: none;
    align-items: center;
    gap: 10px;
    padding: 15px 28px;
    font-family: var(--font);
    font-size: 1rem;
    font-weight: 600;
    letter-spacing: 0.01em;
    color: #fff;
    background: linear-gradient(135deg, var(--perc-orange) 0%, #d84510 100%);
    border: none;
    border-radius: 999px;
    cursor: pointer;
    box-shadow: 0 8px 32px rgba(241, 93, 33, 0.4), inset 0 1px 0 rgba(255,255,255,0.25);
    transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease);
    opacity: 0;
}
.cta-button.visible {
    display: inline-flex;
    animation: cta-in 0.7s var(--ease) forwards;
}
@keyframes cta-in {
    from { opacity: 0; transform: translateY(18px) scale(0.96); }
    to   { opacity: 1; transform: translateY(0) scale(1); }
}
.cta-button:hover {
    transform: translateY(-2px) scale(1.02);
    box-shadow: 0 12px 40px rgba(241, 93, 33, 0.55), inset 0 1px 0 rgba(255,255,255,0.3);
}
.cta-button:focus-visible {
    outline: 2px solid #fff;
    outline-offset: 3px;
}
.cta-button svg { transition: transform 0.3s var(--ease); }
.cta-button:hover svg { transform: translateX(4px); }

/* =========================================================================
   DECK (bottom controls)
   ========================================================================= */
.deck {
    position: fixed;
    bottom: 0; left: 0; right: 0;
    z-index: 30;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 14px;
    padding: 0 40px 26px;
}

/* Progress track */
.progress-track {
    width: min(860px, 80vw);
    height: 3px;
    background: rgba(255,255,255,0.08);
    border-radius: 3px;
    cursor: pointer;
    position: relative;
    transition: opacity 0.6s var(--ease) 2.6s;
}
.progress-fill {
    height: 100%;
    width: 8.33%;
    background: linear-gradient(90deg, var(--perc-blue), var(--perc-orange));
    border-radius: 3px;
    box-shadow: 0 0 12px rgba(241,93,33,0.6);
    transition: width 0.8s var(--ease);
}
.progress-track:focus-visible {
    outline: 2px solid var(--perc-orange);
    outline-offset: 4px;
}

/* Navigation dock */
.nav-dock {
    display: flex;
    gap: 4px;
    padding: 10px 14px;
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: 999px;
    box-shadow: 0 12px 40px rgba(0,0,0,0.4);
    transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}
.nav-dock.hidden {
    opacity: 0;
    transform: translateY(24px);
    pointer-events: none;
}

.nav-item {
    position: relative;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 9px 13px;
    border-radius: 999px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 5px;
    transition: background 0.3s var(--ease), transform 0.3s var(--ease);
    font-family: var(--font);
}
.nav-item:hover { background: rgba(255,255,255,0.07); transform: translateY(-2px); }
.nav-item:focus-visible { outline: 2px solid var(--perc-orange); outline-offset: 2px; }

.nav-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: rgba(255,255,255,0.35);
    transition: all 0.35s var(--ease);
}
.nav-item:hover .nav-dot { background: rgba(255,255,255,0.7); }

.nav-item.active { background: rgba(241,93,33,0.14); }
.nav-item.active .nav-dot {
    background: var(--perc-orange);
    box-shadow: 0 0 12px var(--perc-orange), 0 0 4px var(--perc-orange);
    transform: scale(1.4);
}

.nav-label {
    font-size: 0.6rem;
    font-weight: 500;
    letter-spacing: 0.02em;
    color: var(--text-faint);
    max-width: 78px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    transition: color 0.3s var(--ease);
}
.nav-item:hover .nav-label,
.nav-item.active .nav-label { color: var(--text); }

/* Deck meta row */
.deck-meta {
    display: flex;
    align-items: center;
    gap: 18px;
    font-size: 0.68rem;
    color: var(--text-faint);
    font-weight: 400;
    letter-spacing: 0.05em;
}
.autoplay-indicator {
    color: var(--perc-orange);
    font-weight: 600;
}
.hint { opacity: 0.6; }
.step-counter {
    font-variant-numeric: tabular-nums;
    color: var(--text-dim);
}

/* =========================================================================
   MOBILE NAVIGATION (prev / next + current section label)
   Hidden on desktop, swaps in for the .nav-dock on narrow screens.
   ========================================================================= */
.mobile-nav {
    display: none;             /* hidden on desktop */
    align-items: center;
    gap: 6px;
    padding: 8px 8px;
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: 999px;
    box-shadow: 0 12px 40px rgba(0,0,0,0.4);
    width: min(440px, 92vw);
}

.mobile-nav-btn {
    flex: 0 0 auto;
    width: 44px; height: 44px;       /* 44px = comfortable tap target */
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255,255,255,0.06);
    border: 1px solid var(--glass-border);
    border-radius: 50%;
    color: var(--text);
    cursor: pointer;
    transition: background 0.25s var(--ease), transform 0.25s var(--ease), border-color 0.25s var(--ease);
}
.mobile-nav-btn:hover, .mobile-nav-btn:active {
    background: rgba(241,93,33,0.18);
    border-color: var(--glass-border-strong);
    transform: scale(1.06);
}
.mobile-nav-btn:focus-visible { outline: 2px solid var(--perc-orange); outline-offset: 2px; }

.mobile-nav-label {
    flex: 1 1 auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2px;
    min-width: 0;                    /* allow truncation */
    padding: 0 6px;
}
#mobile-section-name {
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--text);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 100%;
}
.mobile-step {
    font-size: 0.62rem;
    font-weight: 400;
    letter-spacing: 0.05em;
    color: var(--perc-orange);
    font-variant-numeric: tabular-nums;
}

/* =========================================================================
   ACCESSIBILITY
   ========================================================================= */
.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;
}

/* =========================================================================
   RESPONSIVE
   ========================================================================= */
@media (max-width: 900px) {
    .top-bar { padding: 18px 20px; }
    .top-meta { display: none; }
    .text-overlay { padding: 0 5vw; }
    .text-inner { max-width: 90vw; }
    .deck { padding: 0 16px 18px; gap: 10px; }

    /* Swap the desktop dock for the mobile prev/next control */
    .nav-dock { display: none !important; }
    .mobile-nav { display: flex; }

    /* On mobile, simplify the meta row to just the step counter */
    .deck-meta .hint { display: none; }
    .deck-meta { gap: 12px; }
}

@media (max-height: 600px) {
    .text-overlay { align-items: flex-start; padding-top: 80px; }
}

/* =========================================================================
   REDUCED MOTION
   ========================================================================= */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    .headline, .supporting-text, .subtext, .section-metric {
        filter: none !important;
    }
}

/* =========================================================================
   WEBGL FALLBACK
   When WebGL is unavailable, hide the empty canvas and lean on the branded
   ambient gradient (body::before) so the page still reads as intentional.
   ========================================================================= */
.no-webgl #webgl-canvas { display: none; }
.no-webgl body::before { animation: fallback-drift 24s ease-in-out infinite alternate; }
@keyframes fallback-drift {
    from { transform: scale(1) rotate(0deg); }
    to   { transform: scale(1.15) rotate(2deg); }
}
.no-webgl .text-overlay { padding-top: 0; }
.no-webgl .nav-dock,
.no-webgl .progress-track { display: none !important; }