/* ========================================
   Project Subpage — shared visual language with main site
   ======================================== */

body.project-page {
    min-height: 100vh;
    /* Override main site's loader-locked overflow */
    overflow-x: hidden;
    overflow-y: auto;
}

/* Hide elements that don't belong on subpages */
body.project-page .loader,
body.project-page .main-nav,
body.project-page .page-nav,
body.project-page .scroll-progress,
body.project-page #matrix-canvas {
    display: none !important;
}

/* ========================================
   Top Bar
   ======================================== */

.project-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 3rem;
    background: rgba(5, 5, 5, 0.6);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
}

.project-nav-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    padding: 0.65rem 1.25rem;
    border: 1px solid var(--border-color);
    border-radius: 999px;
    color: var(--text-light-grey);
    text-decoration: none;
    font-family: 'Montserrat', sans-serif;
    font-size: 0.8rem;
    font-weight: 500;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    transition: all 0.3s var(--ease-smooth);
}

.project-nav-btn:hover {
    border-color: var(--border-hover);
    color: var(--text-white);
    background: var(--accent-subtle);
    transform: translateY(-1px);
}

.project-nav-btn .arrow {
    font-size: 1rem;
    transition: transform 0.3s var(--ease-smooth);
}

.project-nav-back:hover .arrow {
    transform: translateX(-4px);
}

.project-nav-home:hover .arrow {
    transform: translateX(4px);
}

/* ========================================
   Hero
   ======================================== */

.project-hero {
    min-height: 100vh;
    padding: 9rem 4rem 6rem;
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 4rem;
    position: relative;
    z-index: 1;
    max-width: 1600px;
    margin: 0 auto;
}

.project-hero-inner {
    max-width: 1100px;
}

.project-tagline {
    font-family: 'Montserrat', sans-serif;
    font-size: 0.8rem;
    font-weight: 500;
    letter-spacing: 0.25em;
    color: var(--text-grey);
    margin-bottom: 1.5rem;
    text-transform: uppercase;
}

.project-title-xl {
    font-family: 'Montserrat', 'Futura', sans-serif;
    font-size: clamp(4rem, 12vw, 9rem);
    font-weight: 700;
    line-height: 0.95;
    letter-spacing: -0.02em;
    color: var(--text-white);
    margin: 0 0 1.5rem;
}

.project-subtitle {
    font-family: 'Rajdhani', sans-serif;
    font-size: clamp(1.25rem, 2.2vw, 1.75rem);
    font-weight: 300;
    line-height: 1.4;
    color: var(--text-light-grey);
    max-width: 800px;
    margin: 0 0 3rem;
}

.project-meta-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
    max-width: 900px;
}

.meta-cell {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.meta-label {
    font-family: 'Montserrat', sans-serif;
    font-size: 0.7rem;
    font-weight: 500;
    letter-spacing: 0.2em;
    color: var(--text-grey);
    text-transform: uppercase;
}

.meta-value {
    font-family: 'Rajdhani', sans-serif;
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-white);
}

/* Hero cover image */
.project-cover {
    position: relative;
    width: 100%;
    overflow: hidden;
    border-radius: 4px;
    border: 1px solid var(--border-color);
}

.project-cover img {
    width: 100%;
    height: auto;
    display: block;
}

.project-cover-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, transparent 0%, rgba(5, 5, 5, 0.4) 100%);
    pointer-events: none;
}

/* ========================================
   Section
   ======================================== */

.project-section {
    padding: 7rem 4rem;
    position: relative;
    z-index: 1;
}

.project-container {
    max-width: 1400px;
    margin: 0 auto;
}

.section-eyebrow {
    font-family: 'Montserrat', sans-serif;
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.3em;
    color: var(--text-grey);
    text-transform: uppercase;
    margin-bottom: 1.5rem;
}

.project-h2 {
    font-family: 'Montserrat', sans-serif;
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 300;
    letter-spacing: -0.01em;
    color: var(--text-white);
    margin: 0 0 3rem;
    line-height: 1.1;
}

.project-lead {
    font-family: 'Rajdhani', sans-serif;
    font-size: clamp(1.1rem, 1.5vw, 1.4rem);
    font-weight: 300;
    line-height: 1.6;
    color: var(--text-light-grey);
    max-width: 900px;
    margin: 0;
}

/* ========================================
   Features Grid
   ======================================== */

.features-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
}

.feature-card {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    padding: 2.5rem;
    border: 1px solid var(--border-color);
    background: rgba(255, 255, 255, 0.02);
    border-radius: 4px;
    transition: all 0.4s var(--ease-smooth);
    position: relative;
    overflow: hidden;
    text-decoration: none;
    color: inherit;
}

.feature-card .feature-num,
.feature-card .feature-title,
.feature-card .feature-desc {
    margin: 0;
}

.feature-cta {
    margin-top: auto;
    padding-top: 0.75rem;
    font-family: 'Montserrat', sans-serif;
    font-size: 0.72rem;
    font-weight: 500;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--text-grey);
    transition: color 0.3s var(--ease-smooth), transform 0.3s var(--ease-smooth);
    display: inline-block;
}

.feature-card:hover .feature-cta {
    color: var(--text-white);
    transform: translateX(4px);
}

.demo-card {
    scroll-margin-top: 6rem;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--text-white), transparent);
    opacity: 0;
    transition: opacity 0.4s var(--ease-smooth);
}

.feature-card:hover {
    border-color: var(--border-hover);
    background: rgba(255, 255, 255, 0.04);
    transform: translateY(-4px);
}

.feature-card:hover::before {
    opacity: 0.6;
}

.feature-num {
    font-family: 'Orbitron', sans-serif;
    font-size: 0.85rem;
    font-weight: 600;
    letter-spacing: 0.2em;
    color: var(--text-grey);
    margin-bottom: 1.25rem;
}

.feature-title {
    font-family: 'Montserrat', sans-serif;
    font-size: 1.4rem;
    font-weight: 500;
    color: var(--text-white);
    margin: 0 0 1rem;
    letter-spacing: -0.01em;
}

.feature-desc {
    font-family: 'Rajdhani', sans-serif;
    font-size: 1.05rem;
    font-weight: 300;
    line-height: 1.6;
    color: var(--text-light-grey);
    margin: 0;
}

/* ========================================
   Interactive Demos
   ======================================== */

.demos-hint {
    font-family: 'Rajdhani', sans-serif;
    font-size: 1rem;
    font-weight: 300;
    color: var(--text-grey);
    margin: -2rem 0 3rem;
}

.demos-stack {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.demo-card {
    border: 1px solid var(--border-color);
    background: rgba(255, 255, 255, 0.02);
    border-radius: 6px;
    overflow: hidden;
    transition: border-color 0.4s var(--ease-smooth);
}

.demo-card:hover {
    border-color: var(--border-hover);
}

.demo-head {
    display: flex;
    align-items: center;
    gap: 1.25rem;
    padding: 1.5rem 2rem;
    border-bottom: 1px solid var(--border-color);
    background: rgba(255, 255, 255, 0.015);
}

.demo-num {
    font-family: 'Orbitron', sans-serif;
    font-size: 0.85rem;
    font-weight: 600;
    letter-spacing: 0.2em;
    color: var(--text-grey);
}

.demo-meta {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.demo-title {
    font-family: 'Montserrat', sans-serif;
    font-size: 1.2rem;
    font-weight: 500;
    color: var(--text-white);
    margin: 0;
    letter-spacing: -0.01em;
}

.demo-sub {
    font-family: 'Rajdhani', sans-serif;
    font-size: 0.95rem;
    font-weight: 300;
    color: var(--text-grey);
    margin: 0;
}

.demo-body {
    padding: 2rem;
}

.demo-body-split {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

/* ----- Demo 1: Team Up ----- */

.teamup-tabs {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

.teamup-tab {
    padding: 0.5rem 1rem;
    border: 1px solid var(--border-color);
    background: transparent;
    color: var(--text-grey);
    font-family: 'Montserrat', sans-serif;
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    border-radius: 999px;
    cursor: none;
    transition: all 0.25s var(--ease-smooth);
}

.teamup-tab:hover {
    color: var(--text-light-grey);
    border-color: var(--border-hover);
}

.teamup-tab.active {
    background: var(--text-white);
    color: var(--black);
    border-color: var(--text-white);
}

.teamup-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
}

.teamup-card {
    padding: 1.25rem;
    border: 1px solid var(--border-color);
    background: rgba(255, 255, 255, 0.025);
    border-radius: 6px;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    transition: all 0.3s var(--ease-smooth);
}

.teamup-card:hover {
    border-color: var(--border-hover);
    background: rgba(255, 255, 255, 0.045);
    transform: translateY(-2px);
}

.teamup-card-head {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.teamup-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: linear-gradient(135deg, #555, #222);
    color: var(--text-white);
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: 'Orbitron', sans-serif;
    font-size: 0.75rem;
    font-weight: 600;
    flex-shrink: 0;
}

.teamup-name {
    font-family: 'Montserrat', sans-serif;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-white);
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
}

.teamup-me-badge {
    font-family: 'Orbitron', sans-serif;
    font-size: 0.55rem;
    letter-spacing: 0.15em;
    color: var(--black);
    background: var(--text-white);
    padding: 0.15rem 0.4rem;
    border-radius: 3px;
    font-weight: 600;
}

.teamup-role {
    font-family: 'Rajdhani', sans-serif;
    font-size: 0.78rem;
    color: var(--text-grey);
}

.teamup-card.is-me {
    border-color: rgba(255, 255, 255, 0.3);
    background: rgba(255, 255, 255, 0.045);
}

.teamup-card.is-me .teamup-avatar {
    background: linear-gradient(135deg, #fff, #aaa);
    color: var(--black);
}

.teamup-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.35rem;
}

.teamup-tag {
    font-family: 'Montserrat', sans-serif;
    font-size: 0.62rem;
    font-weight: 500;
    letter-spacing: 0.08em;
    color: var(--text-light-grey);
    padding: 0.2rem 0.5rem;
    background: rgba(255, 255, 255, 0.06);
    border-radius: 3px;
    text-transform: uppercase;
}

.teamup-connect {
    margin-top: auto;
    padding: 0.55rem 0.9rem;
    border: 1px solid var(--border-color);
    background: transparent;
    color: var(--text-light-grey);
    font-family: 'Montserrat', sans-serif;
    font-size: 0.72rem;
    font-weight: 500;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    border-radius: 4px;
    cursor: none;
    transition: all 0.25s var(--ease-smooth);
}

.teamup-connect:hover {
    border-color: var(--text-white);
    color: var(--text-white);
}

.teamup-card.connected .teamup-connect {
    background: var(--text-white);
    color: var(--black);
    border-color: var(--text-white);
}

.teamup-status {
    margin-top: 1rem;
    font-family: 'Rajdhani', sans-serif;
    font-size: 0.9rem;
    color: var(--text-grey);
}

/* ----- Demo 2: Lecture Player ----- */

.lecture-player {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.lecture-stage {
    aspect-ratio: 16 / 9;
    border: 1px solid var(--border-color);
    background:
        radial-gradient(circle at 30% 30%, rgba(255, 255, 255, 0.06), transparent 60%),
        linear-gradient(135deg, #0d0d0d, #1a1a1a);
    border-radius: 4px;
    position: relative;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 2rem;
    overflow: hidden;
    cursor: none;
    transition: border-color 0.3s var(--ease-smooth);
}

.lecture-stage:hover {
    border-color: var(--border-hover);
}

/* The center play overlay is shown only when paused (.show class is toggled in JS) */

.lecture-stage::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.025) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.025) 1px, transparent 1px);
    background-size: 40px 40px;
    pointer-events: none;
}

.lecture-stage-title {
    font-family: 'Montserrat', sans-serif;
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--text-white);
    text-align: center;
    z-index: 1;
}

.lecture-stage-chapter {
    font-family: 'Rajdhani', sans-serif;
    font-size: 0.95rem;
    color: var(--text-grey);
    margin-top: 0.5rem;
    z-index: 1;
}

.lecture-playstate {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.3s var(--ease-smooth);
}

.lecture-playstate.show {
    opacity: 1;
}


.lecture-controls {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.lecture-play {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    border: 1px solid var(--border-color);
    background: rgba(255, 255, 255, 0.04);
    color: var(--text-white);
    cursor: none;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.25s var(--ease-smooth);
    flex-shrink: 0;
}

.lecture-play:hover {
    border-color: var(--text-white);
    background: rgba(255, 255, 255, 0.1);
}

.play-icon-btn {
    width: 14px;
    height: 14px;
    display: block;
}

.play-icon-btn .icon-pause {
    display: none;
}

.lecture-play.playing .play-icon-btn .icon-play {
    display: none;
}

.lecture-play.playing .play-icon-btn .icon-pause {
    display: inline;
}

/* Big center play triangle on stage */
.play-icon-svg {
    width: 56px;
    height: 56px;
    color: rgba(255, 255, 255, 0.7);
    filter: drop-shadow(0 0 12px rgba(255, 255, 255, 0.35));
}

.lecture-progress-wrap {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.lecture-progress {
    position: relative;
    height: 4px;
    background: rgba(255, 255, 255, 0.08);
    border-radius: 2px;
    cursor: none;
}

.lecture-progress-fill {
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    background: var(--text-white);
    border-radius: 2px;
    width: 0%;
    transition: width 0.1s linear;
}

.lecture-progress-knob {
    position: absolute;
    top: 50%;
    width: 12px;
    height: 12px;
    background: var(--text-white);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    left: 0%;
    transition: left 0.1s linear;
    box-shadow: 0 0 8px rgba(255, 255, 255, 0.4);
}

.lecture-time {
    font-family: 'Orbitron', sans-serif;
    font-size: 0.7rem;
    color: var(--text-grey);
    letter-spacing: 0.1em;
}

.lecture-chapters {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.chapter-chip {
    padding: 0.45rem 0.8rem;
    border: 1px solid var(--border-color);
    background: transparent;
    color: var(--text-grey);
    font-family: 'Rajdhani', sans-serif;
    font-size: 0.8rem;
    font-weight: 500;
    border-radius: 999px;
    cursor: none;
    transition: all 0.25s var(--ease-smooth);
}

.chapter-chip:hover {
    color: var(--text-white);
    border-color: var(--border-hover);
}

.chapter-chip.active {
    color: var(--black);
    background: var(--text-white);
    border-color: var(--text-white);
}

/* ----- Demo 3: Quiz ----- */

.quiz-card {
    max-width: 700px;
}

.quiz-progress {
    display: flex;
    justify-content: space-between;
    font-family: 'Montserrat', sans-serif;
    font-size: 0.7rem;
    font-weight: 500;
    letter-spacing: 0.15em;
    color: var(--text-grey);
    text-transform: uppercase;
    margin-bottom: 1rem;
}

.quiz-question {
    font-family: 'Montserrat', sans-serif;
    font-size: 1.15rem;
    font-weight: 400;
    color: var(--text-white);
    line-height: 1.5;
    margin: 0 0 1.5rem;
}

.quiz-options {
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
    margin-bottom: 1.25rem;
}

.quiz-option {
    text-align: left;
    padding: 0.95rem 1.2rem;
    border: 1px solid var(--border-color);
    background: rgba(255, 255, 255, 0.02);
    color: var(--text-light-grey);
    font-family: 'Rajdhani', sans-serif;
    font-size: 1rem;
    border-radius: 4px;
    cursor: none;
    display: flex;
    gap: 0.85rem;
    align-items: center;
    transition: all 0.25s var(--ease-smooth);
}

.quiz-option:hover:not(:disabled) {
    border-color: var(--border-hover);
    background: rgba(255, 255, 255, 0.05);
}

.quiz-option-letter {
    font-family: 'Orbitron', sans-serif;
    font-size: 0.75rem;
    color: var(--text-grey);
    width: 18px;
    flex-shrink: 0;
}

.quiz-option.correct {
    border-color: rgba(120, 220, 150, 0.6);
    background: rgba(120, 220, 150, 0.08);
    color: var(--text-white);
}

.quiz-option.wrong {
    border-color: rgba(255, 110, 110, 0.6);
    background: rgba(255, 110, 110, 0.08);
    color: var(--text-white);
}

.quiz-feedback {
    font-family: 'Rajdhani', sans-serif;
    font-size: 0.95rem;
    color: var(--text-light-grey);
    min-height: 1.5em;
    margin-bottom: 1rem;
}

.quiz-feedback.correct { color: rgb(150, 230, 175); }
.quiz-feedback.wrong { color: rgb(255, 150, 150); }

.quiz-next {
    padding: 0.7rem 1.5rem;
    border: 1px solid var(--border-color);
    background: transparent;
    color: var(--text-grey);
    font-family: 'Montserrat', sans-serif;
    font-size: 0.78rem;
    font-weight: 500;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    border-radius: 4px;
    cursor: none;
    transition: all 0.25s var(--ease-smooth);
}

.quiz-next:not(:disabled) {
    color: var(--text-white);
    border-color: var(--text-white);
}

.quiz-next:not(:disabled):hover {
    background: var(--text-white);
    color: var(--black);
}

.quiz-next:disabled {
    opacity: 0.4;
}

/* ----- Demo 4: Tutorial Whiteboard ----- */

.tutorial-body {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 240px;
    grid-template-rows: 420px auto;
    gap: 1.25rem;
    padding: 1.5rem;
}

.tutorial-body > .whiteboard {
    grid-column: 1;
    grid-row: 1;
    height: 420px;
}

.tutorial-body > .tutorial-side {
    grid-column: 2;
    grid-row: 1;
    height: 420px;
}

.tutorial-body > .tutorial-content {
    grid-column: 1 / -1;
    grid-row: 2;
}

.whiteboard {
    border: 1px solid var(--border-color);
    background: rgba(255, 255, 255, 0.02);
    border-radius: 6px;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.whiteboard-meta {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--border-color);
    font-family: 'Orbitron', sans-serif;
    font-size: 0.7rem;
    color: var(--text-grey);
    letter-spacing: 0.12em;
}

.live-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    padding: 0.2rem 0.55rem;
    border: 1px solid rgba(255, 80, 80, 0.4);
    background: rgba(255, 80, 80, 0.08);
    color: rgb(255, 150, 150);
    border-radius: 3px;
    font-size: 0.62rem;
    font-weight: 600;
    letter-spacing: 0.18em;
}

.live-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: rgb(255, 80, 80);
    box-shadow: 0 0 6px rgba(255, 80, 80, 0.7);
    animation: chatPulse 1.5s ease-in-out infinite;
}

.meta-item {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
}

.meta-icon {
    color: rgba(255, 255, 255, 0.4);
    font-size: 0.6rem;
}

.whiteboard-stage {
    flex: 1;
    min-height: 240px;
    background:
        radial-gradient(circle at 30% 30%, rgba(255, 255, 255, 0.05), transparent 60%),
        linear-gradient(135deg, #0d0d0d, #1a1a1a);
    position: relative;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 2rem 1.75rem;
    overflow: hidden;
    text-align: center;
}

.whiteboard-stage::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.022) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.022) 1px, transparent 1px);
    background-size: 36px 36px;
    pointer-events: none;
}

.whiteboard-title {
    font-family: 'Montserrat', sans-serif;
    font-size: 1.15rem;
    font-weight: 500;
    color: var(--text-white);
    z-index: 1;
}

.whiteboard-instructor {
    font-family: 'Rajdhani', sans-serif;
    font-size: 0.9rem;
    color: var(--text-grey);
    margin-top: 0.4rem;
    z-index: 1;
}

.whiteboard-caption {
    font-family: 'Rajdhani', sans-serif;
    font-size: 1rem;
    line-height: 1.65;
    color: var(--text-light-grey);
    margin: 1.5rem 0 0.85rem;
    max-width: 460px;
    z-index: 1;
}

.whiteboard-hint {
    font-family: 'Montserrat', sans-serif;
    font-size: 0.7rem;
    font-weight: 500;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--text-grey);
    margin: 0;
    z-index: 1;
}

.whiteboard-toolbar {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.6rem 0.8rem;
    border-top: 1px solid var(--border-color);
    background: rgba(0, 0, 0, 0.25);
}

.wb-tool {
    width: 32px;
    height: 32px;
    border: 1px solid var(--border-color);
    background: transparent;
    color: var(--text-grey);
    border-radius: 4px;
    cursor: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s var(--ease-smooth);
}

.wb-tool svg {
    width: 16px;
    height: 16px;
}

.wb-tool:hover {
    color: var(--text-white);
    border-color: var(--border-hover);
}

.wb-tool.active {
    color: var(--black);
    background: var(--text-white);
    border-color: var(--text-white);
}

.wb-toolbar-divider {
    width: 1px;
    height: 20px;
    background: var(--border-color);
    margin: 0 0.3rem;
}

.wb-toggle {
    display: inline-flex;
    align-items: center;
    gap: 0.55rem;
    padding: 0.35rem 0.7rem;
    border: 1px solid var(--border-color);
    background: transparent;
    color: var(--text-grey);
    font-family: 'Montserrat', sans-serif;
    font-size: 0.7rem;
    font-weight: 500;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    border-radius: 4px;
    cursor: none;
    transition: all 0.2s var(--ease-smooth);
}

.wb-toggle-label {
    color: var(--text-light-grey);
}

.wb-toggle-state {
    font-family: 'Orbitron', sans-serif;
    font-size: 0.65rem;
    color: var(--text-grey);
}

.wb-toggle.on {
    border-color: rgb(150, 230, 175);
    color: rgb(150, 230, 175);
}

.wb-toggle.on .wb-toggle-state {
    color: rgb(150, 230, 175);
}

.tutorial-content {
    border: 1px solid var(--border-color);
    background: rgba(255, 255, 255, 0.015);
    border-radius: 6px;
    padding: 1.25rem 1.4rem;
    position: relative;
}

.tutorial-content-title {
    font-family: 'Montserrat', sans-serif;
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-white);
    margin: 0 0 0.85rem;
    letter-spacing: 0.02em;
}

.tutorial-list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 0.55rem;
    font-family: 'Rajdhani', sans-serif;
    font-size: 0.98rem;
    color: var(--text-light-grey);
    line-height: 1.55;
}

.tutorial-list li {
    padding-left: 1rem;
    position: relative;
}

.tutorial-list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0.65em;
    width: 4px;
    height: 4px;
    border-radius: 50%;
    background: var(--text-grey);
}

.term {
    color: var(--text-white);
    border-bottom: 1px dashed rgba(150, 230, 175, 0.5);
    padding-bottom: 1px;
    cursor: none;
    transition: all 0.2s var(--ease-smooth);
}

.term-light {
    color: rgb(200, 245, 215);
    border-bottom-color: rgba(150, 230, 175, 0.7);
}

.term:hover,
.term.active {
    color: rgb(180, 240, 200);
    border-bottom-color: rgb(150, 230, 175);
    background: rgba(150, 230, 175, 0.12);
}

.term-tooltip {
    position: absolute;
    z-index: 20;
    max-width: 280px;
    padding: 0.85rem 1rem;
    background: rgba(15, 15, 15, 0.96);
    border: 1px solid rgba(150, 230, 175, 0.35);
    border-radius: 4px;
    font-family: 'Rajdhani', sans-serif;
    font-size: 0.9rem;
    line-height: 1.5;
    color: var(--text-light-grey);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.5);
    pointer-events: none;
    opacity: 0;
    transform: translateY(4px);
    transition: opacity 0.2s var(--ease-smooth), transform 0.2s var(--ease-smooth);
}

.term-tooltip.visible {
    opacity: 1;
    transform: translateY(0);
}

.term-tooltip-head {
    font-family: 'Montserrat', sans-serif;
    font-size: 0.7rem;
    font-weight: 500;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: rgb(150, 230, 175);
    margin-bottom: 0.4rem;
}

/* Right narrow chat */

.tutorial-side {
    display: flex;
    min-width: 0;
    height: 100%;
}

.chat-panel {
    flex: 1;
    width: 100%;
    border: 1px solid var(--border-color);
    background: rgba(255, 255, 255, 0.02);
    border-radius: 6px;
    display: flex;
    flex-direction: column;
    height: 100%;
    min-height: 0;
    overflow: hidden;
}

.chat-head {
    display: flex;
    align-items: center;
    gap: 0.55rem;
    padding: 0.75rem 0.9rem;
    border-bottom: 1px solid var(--border-color);
    font-family: 'Montserrat', sans-serif;
    font-size: 0.72rem;
    font-weight: 500;
    color: var(--text-light-grey);
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.chat-live-dot {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: rgb(255, 80, 80);
    box-shadow: 0 0 6px rgba(255, 80, 80, 0.6);
    animation: chatPulse 1.5s ease-in-out infinite;
}

@keyframes chatPulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.4; }
}

.chat-count {
    margin-left: auto;
    font-family: 'Orbitron', sans-serif;
    font-size: 0.65rem;
    color: var(--text-grey);
    letter-spacing: 0.1em;
    text-transform: none;
}

.chat-stream {
    flex: 1;
    overflow-y: auto;
    padding: 0.85rem 0.9rem;
    display: flex;
    flex-direction: column;
    gap: 0.55rem;
}

.chat-msg {
    display: flex;
    flex-direction: column;
    gap: 0.15rem;
    font-family: 'Rajdhani', sans-serif;
    font-size: 0.85rem;
    line-height: 1.4;
    animation: chatMsgIn 0.3s var(--ease-smooth);
}

@keyframes chatMsgIn {
    from { opacity: 0; transform: translateY(4px); }
    to { opacity: 1; transform: translateY(0); }
}

.chat-msg-name {
    color: var(--text-white);
    font-weight: 500;
    font-size: 0.72rem;
    letter-spacing: 0.04em;
}

.chat-msg-name.instructor {
    color: rgb(150, 230, 175);
}

.chat-msg-name.you {
    color: rgb(180, 200, 255);
}

.chat-msg-text {
    color: var(--text-light-grey);
    word-wrap: break-word;
    min-width: 0;
}

.chat-form {
    display: flex;
    gap: 0.4rem;
    padding: 0.6rem 0.7rem;
    border-top: 1px solid var(--border-color);
}

.chat-input {
    flex: 1;
    min-width: 0;
    padding: 0.5rem 0.7rem;
    border: 1px solid var(--border-color);
    background: rgba(0, 0, 0, 0.3);
    color: var(--text-white);
    font-family: 'Rajdhani', sans-serif;
    font-size: 0.85rem;
    border-radius: 4px;
    outline: none;
    transition: border-color 0.25s var(--ease-smooth);
}

.chat-input:focus {
    border-color: var(--border-hover);
}

.chat-input::placeholder {
    color: var(--text-grey);
}

.chat-send {
    width: 32px;
    height: 32px;
    border: 1px solid var(--border-color);
    background: transparent;
    color: var(--text-light-grey);
    font-size: 0.95rem;
    border-radius: 4px;
    cursor: none;
    transition: all 0.25s var(--ease-smooth);
    flex-shrink: 0;
}

.chat-send:hover {
    background: var(--text-white);
    color: var(--black);
    border-color: var(--text-white);
}

/* Bottom AI bar */

.ai-bar {
    border-top: 1px solid var(--border-color);
    padding: 1.1rem 1.5rem 1.4rem;
    background: rgba(0, 0, 0, 0.25);
}

.ai-bar-head {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    margin-bottom: 0.7rem;
    font-family: 'Montserrat', sans-serif;
    font-size: 0.72rem;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--text-light-grey);
}

.ai-dot {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: rgb(150, 230, 175);
    box-shadow: 0 0 6px rgba(150, 230, 175, 0.6);
}

.ai-bar-title {
    color: var(--text-white);
    font-weight: 500;
}

.ai-bar-hint {
    margin-left: 0.5rem;
    color: var(--text-grey);
    text-transform: none;
    letter-spacing: 0.04em;
    font-family: 'Rajdhani', sans-serif;
    font-size: 0.85rem;
}

.ai-bar-form {
    display: flex;
    gap: 0.5rem;
}

.ai-bar-input {
    flex: 1;
    padding: 0.7rem 0.95rem;
    border: 1px solid var(--border-color);
    background: rgba(0, 0, 0, 0.4);
    color: var(--text-white);
    font-family: 'Rajdhani', sans-serif;
    font-size: 0.95rem;
    border-radius: 4px;
    outline: none;
    transition: border-color 0.25s var(--ease-smooth);
}

.ai-bar-input:focus {
    border-color: rgba(150, 230, 175, 0.5);
}

.ai-bar-input::placeholder {
    color: var(--text-grey);
}

.ai-bar-send {
    width: 42px;
    border: 1px solid var(--border-color);
    background: transparent;
    color: var(--text-light-grey);
    font-size: 1.05rem;
    border-radius: 4px;
    cursor: none;
    transition: all 0.25s var(--ease-smooth);
    flex-shrink: 0;
}

.ai-bar-send:hover {
    background: rgb(150, 230, 175);
    color: var(--black);
    border-color: rgb(150, 230, 175);
}

.ai-bar-stream {
    display: flex;
    flex-direction: column;
    gap: 0.55rem;
    margin-top: 0.85rem;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s var(--ease-smooth);
}

.ai-bar-stream.has-msgs {
    max-height: 220px;
    overflow-y: auto;
}

.ai-msg {
    padding: 0.7rem 0.95rem;
    border-radius: 4px;
    font-family: 'Rajdhani', sans-serif;
    font-size: 0.92rem;
    line-height: 1.5;
    max-width: 90%;
    word-wrap: break-word;
}

.ai-msg-bot {
    background: rgba(150, 230, 175, 0.06);
    color: var(--text-light-grey);
    border: 1px solid rgba(150, 230, 175, 0.25);
    align-self: flex-start;
}

.ai-msg-user {
    background: var(--text-white);
    color: var(--black);
    align-self: flex-end;
}

/* ========================================
   End / Back Link
   ======================================== */

.project-end {
    padding: 6rem 4rem 8rem;
    text-align: center;
    position: relative;
    z-index: 1;
}

.project-end-link {
    display: inline-flex;
    align-items: center;
    gap: 0.8rem;
    padding: 1.1rem 2.5rem;
    border: 1px solid var(--border-color);
    border-radius: 999px;
    color: var(--text-light-grey);
    text-decoration: none;
    font-family: 'Montserrat', sans-serif;
    font-size: 0.9rem;
    font-weight: 500;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    transition: all 0.3s var(--ease-smooth);
}

.project-end-link:hover {
    border-color: var(--border-hover);
    color: var(--text-white);
    background: var(--accent-subtle);
}

.project-end-link:hover .arrow {
    transform: translateX(-4px);
}

.project-end-link .arrow {
    transition: transform 0.3s var(--ease-smooth);
}

/* ========================================
   Responsive
   ======================================== */

@media (max-width: 900px) {
    .project-nav {
        padding: 1rem 1.5rem;
    }

    .project-nav-btn {
        padding: 0.55rem 1rem;
        font-size: 0.7rem;
    }

    .project-nav-btn span:not(.arrow) {
        display: none;
    }

    .project-hero {
        padding: 7rem 1.5rem 4rem;
        gap: 2.5rem;
    }

    .project-meta-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1.5rem;
    }

    .project-section {
        padding: 5rem 1.5rem;
    }

    .features-grid {
        grid-template-columns: 1fr;
    }

    .feature-card {
        padding: 1.75rem;
    }

    .demo-head {
        padding: 1.25rem 1.25rem;
        gap: 1rem;
    }

    .demo-body {
        padding: 1.25rem;
    }

    .teamup-grid {
        grid-template-columns: 1fr;
    }

    .lecture-controls {
        flex-wrap: wrap;
    }

    .tutorial-body {
        grid-template-columns: 1fr;
        grid-template-rows: auto auto auto;
        padding: 1.25rem;
    }

    .tutorial-body > .whiteboard {
        grid-column: 1;
        grid-row: 1;
        height: auto;
    }

    .tutorial-body > .tutorial-side {
        grid-column: 1;
        grid-row: 2;
        height: 320px;
    }

    .tutorial-body > .tutorial-content {
        grid-column: 1;
        grid-row: 3;
    }

    .ai-bar {
        padding: 1rem 1.25rem 1.25rem;
    }

    .ai-bar-hint {
        display: none;
    }

    .project-end {
        padding: 4rem 1.5rem 6rem;
    }
}