/* ============================================================
   50 Years of Gaming — Futuristic 50th Birthday
   Colour scheme: black + silver
   ============================================================ */

:root {
    --silver-100: #f5f7fa;
    --silver-200: #dde3ea;
    --silver-300: #bcc6d0;
    --silver-400: #9aa6b3;
    --silver-500: #798792;
    --green-100: #eafaf1;
    --green-200: #caf5d7;
    --green-300: #9fe8b5;
    --green-400: #6ad79d;
    --green-500: #39b77a;
    --black-950: #030404;
    --black-900: #0a0d10;
    --black-800: #12181d;
    --black-700: #1a2128;
    --black-600: #2b333b;
    --silver-glow: rgba(221, 227, 234, 0.38);
    --silver-line: rgba(255, 255, 255, 0.14);
    --green-glow: rgba(105, 215, 157, 0.28);
    --white: #f4f7fb;

    --font-display: "Orbitron", sans-serif;
    --font-body: "Rajdhani", sans-serif;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    background:
        radial-gradient(circle at top, rgba(221, 227, 234, 0.12), transparent 30%),
        linear-gradient(180deg, var(--black-950) 0%, var(--black-900) 100%);
    color: var(--white);
    overflow-x: hidden;
    line-height: 1.5;
    position: relative;
}

/* ---------- Backgrounds ---------- */
.grid-bg {
    position: fixed;
    inset: 0;
    z-index: -2;
    background-color: var(--black-900);
    background-image:
        linear-gradient(rgba(221, 227, 234, 0.06) 1px, transparent 1px),
        linear-gradient(90deg, rgba(221, 227, 234, 0.06) 1px, transparent 1px);
    background-size: 44px 44px;
    background-position: center;
    animation: gridMove 20s linear infinite;
}

.grid-bg::after {
    content: "";
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse at 50% 0%, rgba(221, 227, 234, 0.18), transparent 60%),
                radial-gradient(ellipse at 100% 100%, rgba(255, 255, 255, 0.08), transparent 50%);
}

@keyframes gridMove {
    from { background-position: 0 0; }
    to   { background-position: 0 44px; }
}

.scanlines {
    position: fixed;
    inset: 0;
    z-index: -1;
    pointer-events: none;
    background: repeating-linear-gradient(
        to bottom,
        rgba(0, 0, 0, 0),
        rgba(0, 0, 0, 0) 2px,
        rgba(0, 0, 0, 0.18) 3px,
        rgba(0, 0, 0, 0) 4px
    );
    opacity: 0.4;
}

.laser-overlay {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 0;
    overflow: hidden;
}

.laser-beam {
    position: absolute;
    display: block;
    height: 2px;
    border-radius: 999px;
    background: linear-gradient(90deg, transparent, rgba(105, 215, 157, 0.9), rgba(255, 255, 255, 0.95), rgba(105, 215, 157, 0.9), transparent);
    box-shadow: 0 0 12px rgba(105, 215, 157, 0.9), 0 0 24px rgba(255, 255, 255, 0.4);
    opacity: 0;
    animation: laserSweep 8s linear infinite;
}

.beam-1 { top: 18%; left: -20%; width: 44%; transform: rotate(14deg); animation-delay: 0s; }
.beam-2 { top: 36%; left: -10%; width: 52%; transform: rotate(-12deg); animation-delay: 2s; }
.beam-3 { top: 55%; left: -18%; width: 50%; transform: rotate(10deg); animation-delay: 4s; }
.beam-4 { top: 74%; left: -12%; width: 46%; transform: rotate(-15deg); animation-delay: 6s; }

@keyframes laserSweep {
    0% {
        opacity: 0;
        transform: translateX(-10%) scaleX(0.6) rotate(var(--angle, 0deg));
    }
    12% {
        opacity: 1;
    }
    25% {
        opacity: 0.9;
        transform: translateX(15%) scaleX(1) rotate(var(--angle, 0deg));
    }
    50% {
        opacity: 0.7;
    }
    100% {
        opacity: 0;
        transform: translateX(120%) scaleX(1.15) rotate(var(--angle, 0deg));
    }
}

.beam-1 { --angle: 14deg; }
.beam-2 { --angle: -12deg; }
.beam-3 { --angle: 10deg; }
.beam-4 { --angle: -15deg; }

/* ---------- Navigation ---------- */
.nav {
    position: sticky;
    top: 0;
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 2rem;
    background: rgba(10, 13, 16, 0.72);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--silver-line);
}

.nav__logo {
    display: flex;
    align-items: center;
    gap: 0.6rem;
}

.nav__logo-mark {
    font-family: var(--font-display);
    font-weight: 900;
    font-size: 1.5rem;
    color: var(--black-950);
    background: linear-gradient(135deg, var(--green-300), var(--silver-100), var(--silver-400));
    padding: 0.15rem 0.55rem;
    border-radius: 6px;
    box-shadow: 0 0 18px var(--green-glow);
}

.nav__logo-text {
    font-family: var(--font-display);
    font-weight: 700;
    letter-spacing: 3px;
    font-size: 0.95rem;
    color: var(--silver-200);
}

.nav__star {
    color: var(--silver-100);
    font-size: 0.9rem;
    text-shadow: 0 0 12px rgba(255, 255, 255, 0.5);
}

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

.nav__links a {
    color: var(--silver-300);
    text-decoration: none;
    font-weight: 600;
    font-size: 1rem;
    letter-spacing: 1px;
    text-transform: uppercase;
    transition: color 0.2s, text-shadow 0.2s;
}

.nav__links a:hover {
    color: var(--silver-100);
    text-shadow: 0 0 10px rgba(255, 255, 255, 0.38);
}

.nav__cta {
    border: 1px solid var(--silver-200);
    padding: 0.4rem 1rem;
    border-radius: 6px;
    color: var(--silver-100) !important;
}

.nav__cta:hover {
    background: linear-gradient(135deg, var(--silver-300), var(--silver-100));
    color: var(--black-950) !important;
    box-shadow: 0 0 18px rgba(255, 255, 255, 0.22);
}

/* ---------- Buttons ---------- */
.btn {
    display: inline-block;
    font-family: var(--font-display);
    font-weight: 700;
    letter-spacing: 2px;
    text-decoration: none;
    text-transform: uppercase;
    cursor: pointer;
    border: none;
    padding: 1rem 2.4rem;
    border-radius: 8px;
    font-size: 1rem;
    transition: transform 0.15s, box-shadow 0.25s;
}

.btn--primary {
    color: var(--black-950);
    background: linear-gradient(135deg, var(--green-300), var(--silver-100), var(--silver-300));
    box-shadow: 0 0 24px var(--green-glow);
}

.btn--primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 36px rgba(105, 215, 157, 0.25), 0 8px 24px rgba(0, 0, 0, 0.4);
}

.btn--primary:active {
    transform: translateY(0);
}

/* ---------- Hero ---------- */
.hero {
    position: relative;
    min-height: 92vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 4rem 2rem;
    overflow: hidden;
}

.hero__background {
    position: absolute;
    inset: 0;
    z-index: 0;
    opacity: 0.23;
    filter: grayscale(100%) brightness(0.8) blur(1px);
}

.hero__background img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
}

.hero__content {
    position: relative;
    z-index: 2;
    max-width: 820px;
}

.hero__eyebrow {
    font-family: var(--font-display);
    color: var(--silver-200);
    letter-spacing: 4px;
    font-size: 0.9rem;
    margin-bottom: 1rem;
    opacity: 0.85;
}

.hero__eyebrow span {
    display: inline-block;
    margin-right: 0.6rem;
    color: var(--silver-100);
    text-shadow: 0 0 12px rgba(255, 255, 255, 0.4);
}

.hero__title {
    font-family: var(--font-display);
    line-height: 0.9;
    margin-bottom: 1.2rem;
}

.hero__level {
    display: block;
    font-size: clamp(1.6rem, 5vw, 3rem);
    font-weight: 600;
    letter-spacing: 12px;
    color: var(--silver-200);
}

.hero__fifty {
    display: block;
    font-size: clamp(7rem, 26vw, 18rem);
    font-weight: 900;
    background: linear-gradient(180deg, var(--green-200), var(--silver-100), var(--silver-500));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    position: relative;
    text-shadow: 0 0 60px var(--green-glow);
    animation: flicker 4s infinite;
}

@keyframes flicker {
    0%, 100% { opacity: 1; }
    92% { opacity: 1; }
    93% { opacity: 0.6; }
    94% { opacity: 1; }
    96% { opacity: 0.75; }
    97% { opacity: 1; }
}

.hero__subtitle {
    font-size: clamp(1.1rem, 2.5vw, 1.5rem);
    color: var(--silver-200);
    font-weight: 400;
    letter-spacing: 1px;
    margin-bottom: 2rem;
}

.hero__meta {
    display: flex;
    gap: 2rem;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 2.4rem;
}

.hero__meta-item {
    display: flex;
    flex-direction: column;
    padding: 0.8rem 1.4rem;
    border: 1px solid var(--silver-line);
    border-radius: 8px;
    background: rgba(18, 24, 29, 0.72);
    min-width: 200px;
}

.hero__meta-label {
    font-family: var(--font-display);
    font-size: 0.7rem;
    letter-spacing: 3px;
    color: var(--silver-200);
    text-transform: uppercase;
}

.hero__meta-value {
    font-size: 1rem;
    color: var(--white);
    font-weight: 500;
}

.hero__glow {
    position: absolute;
    width: 640px;
    height: 640px;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.12), transparent 65%);
    filter: blur(40px);
    z-index: 1;
    opacity: 0.9;
    animation: pulse 5s ease-in-out infinite;
}

.star-field {
    position: absolute;
    inset: 0;
    pointer-events: none;
    z-index: 0;
}

.star-field span {
    position: absolute;
    font-size: clamp(0.7rem, 1.1vw, 1.2rem);
    color: rgba(255, 255, 255, 0.82);
    text-shadow: 0 0 12px rgba(255, 255, 255, 0.8), 0 0 18px rgba(105, 215, 157, 0.45);
    animation: floatStar 8s ease-in-out infinite;
    opacity: 0.78;
}

.star-field span:nth-child(1) { top: 8%; left: 8%; animation-delay: 0s; }
.star-field span:nth-child(2) { top: 12%; left: 26%; animation-delay: 0.5s; }
.star-field span:nth-child(3) { top: 18%; right: 26%; animation-delay: 1s; }
.star-field span:nth-child(4) { top: 22%; right: 12%; animation-delay: 1.5s; }
.star-field span:nth-child(5) { top: 32%; left: 14%; animation-delay: 2s; }
.star-field span:nth-child(6) { top: 28%; left: 58%; animation-delay: 2.5s; }
.star-field span:nth-child(7) { top: 42%; right: 22%; animation-delay: 3s; }
.star-field span:nth-child(8) { top: 46%; left: 38%; animation-delay: 3.5s; }
.star-field span:nth-child(9) { top: 54%; right: 34%; animation-delay: 4s; }
.star-field span:nth-child(10) { top: 62%; left: 18%; animation-delay: 4.5s; }
.star-field span:nth-child(11) { top: 70%; right: 18%; animation-delay: 5s; }
.star-field span:nth-child(12) { top: 76%; left: 48%; animation-delay: 5.5s; }
.star-field span:nth-child(13) { bottom: 18%; left: 10%; animation-delay: 0.8s; }
.star-field span:nth-child(14) { bottom: 22%; left: 32%; animation-delay: 1.7s; }
.star-field span:nth-child(15) { bottom: 14%; right: 16%; animation-delay: 2.8s; }
.star-field span:nth-child(16) { bottom: 24%; right: 38%; animation-delay: 3.4s; }
.star-field span:nth-child(17) { bottom: 30%; left: 58%; animation-delay: 4.3s; }
.star-field span:nth-child(18) { bottom: 12%; left: 72%; animation-delay: 5.1s; }
.star-field span:nth-child(19) { bottom: 38%; left: 82%; animation-delay: 1.9s; }
.star-field span:nth-child(20) { bottom: 44%; right: 54%; animation-delay: 3.9s; }
.star-field span:nth-child(21) { top: 18%; left: 74%; animation-delay: 2.2s; }
.star-field span:nth-child(22) { top: 68%; left: 66%; animation-delay: 4.8s; }
.star-field span:nth-child(23) { top: 48%; right: 48%; animation-delay: 6s; }
.star-field span:nth-child(24) { bottom: 52%; right: 8%; animation-delay: 6.4s; }
.star-field span:nth-child(25) { bottom: 48%; left: 4%; animation-delay: 7s; }
.star-field span:nth-child(26) { top: 8%; right: 46%; animation-delay: 7.3s; }
.star-field span:nth-child(27) { bottom: 62%; left: 24%; animation-delay: 2.9s; }
.star-field span:nth-child(28) { bottom: 66%; right: 24%; animation-delay: 4.4s; }
.star-field span:nth-child(29) { top: 84%; left: 28%; animation-delay: 5.8s; }
.star-field span:nth-child(30) { top: 86%; right: 28%; animation-delay: 6.8s; }
.star-field span:nth-child(31) { top: 58%; left: 4%; animation-delay: 1.3s; }
.star-field span:nth-child(32) { top: 82%; right: 8%; animation-delay: 4.1s; }

@keyframes floatStar {
    0%, 100% { transform: translateY(0) scale(1); opacity: 0.6; }
    50% { transform: translateY(-10px) scale(1.15); opacity: 1; }
}

@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 0.5; }
    50% { transform: scale(1.15); opacity: 0.7; }
}

/* ---------- Section headers ---------- */
.section-head {
    text-align: center;
    margin-bottom: 3rem;
}

.section-head__stars {
    display: flex;
    justify-content: center;
    gap: 0.8rem;
    margin-bottom: 1rem;
    color: var(--green-200);
    text-shadow: 0 0 10px rgba(105, 215, 157, 0.35), 0 0 14px rgba(255, 255, 255, 0.25);
    letter-spacing: 0.4rem;
    flex-wrap: wrap;
}

.section-title {
    font-family: var(--font-display);
    font-size: clamp(1.8rem, 5vw, 3rem);
    font-weight: 800;
    letter-spacing: 4px;
    color: var(--silver-100);
    text-shadow: 0 0 24px rgba(255, 255, 255, 0.12);
}

.section-sub {
    color: var(--silver-400);
    font-size: 1.1rem;
    letter-spacing: 1px;
    margin-top: 0.6rem;
}

section {
    padding: 5rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

/* ---------- Timeline ---------- */
.timeline__track {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 1.5rem;
}

.era {
    background: linear-gradient(160deg, var(--black-800), var(--black-700));
    border: 1px solid var(--silver-line);
    border-radius: 12px;
    padding: 1.8rem;
    position: relative;
    overflow: hidden;
    transition: transform 0.25s, border-color 0.25s, box-shadow 0.25s;
}

.era::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: linear-gradient(90deg, var(--silver-300), var(--silver-100));
}

.era:hover {
    transform: translateY(-6px);
    border-color: var(--silver-100);
    box-shadow: 0 12px 40px rgba(255, 255, 255, 0.08);
}

.era__year {
    font-family: var(--font-display);
    font-weight: 800;
    font-size: 1.4rem;
    color: var(--silver-200);
    letter-spacing: 2px;
}

.era__title {
    font-family: var(--font-display);
    font-size: 1.15rem;
    margin: 0.6rem 0;
    color: var(--white);
    letter-spacing: 1px;
}

.era__text {
    color: var(--silver-300);
    font-size: 1rem;
}

.era--future {
    border-color: var(--silver-100);
    box-shadow: 0 0 30px rgba(255, 255, 255, 0.08);
}

/* ---------- Gallery ---------- */
.gallery__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 2.4rem 2rem;
    align-items: start;
    padding: 0.5rem 0 0.5rem;
}

.photo {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 0.4rem;
}

.photo__frame {
    position: relative;
    width: 100%;
    aspect-ratio: 1 / 1;
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid var(--silver-line);
    background: linear-gradient(160deg, var(--black-800), var(--black-700));
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.25s, border-color 0.25s, box-shadow 0.25s;
}

.photo__frame::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: linear-gradient(90deg, var(--silver-500), var(--silver-100));
    z-index: 2;
}

.photo:hover .photo__frame {
    transform: translateY(-8px) scale(1.02);
    border-color: var(--green-300);
    box-shadow: 0 12px 42px rgba(105, 215, 157, 0.18), 0 0 24px rgba(255, 255, 255, 0.08);
}

.photo__frame img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    position: relative;
    z-index: 1;
}

.photo__placeholder {
    position: absolute;
    font-family: var(--font-display);
    font-weight: 900;
    font-size: 4rem;
    color: rgba(255, 255, 255, 0.18);
    z-index: 0;
}

.photo__frame--empty {
    border-style: dashed;
}

.photo__caption {
    margin-top: 0.8rem;
    font-family: var(--font-display);
    letter-spacing: 2px;
    color: var(--silver-200);
    font-size: 0.85rem;
    text-transform: uppercase;
}

.gallery__note {
    text-align: center;
    margin-top: 2rem;
    color: var(--silver-400);
    font-size: 0.95rem;
}

.gallery__note code {
    color: var(--silver-100);
    background: var(--black-700);
    padding: 0.1rem 0.4rem;
    border-radius: 4px;
    font-size: 0.9rem;
}

/* ---------- Details ---------- */
.details__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 1.5rem;
}

.detail-card {
    background: linear-gradient(160deg, var(--black-800), var(--black-700));
    border: 1px solid var(--silver-line);
    border-radius: 12px;
    padding: 2rem;
    text-align: center;
    transition: transform 0.25s, border-color 0.25s, box-shadow 0.25s;
}

.detail-card:hover {
    transform: translateY(-6px);
    border-color: var(--silver-100);
    box-shadow: 0 12px 40px rgba(255, 255, 255, 0.08);
}

.detail-card__icon {
    font-size: 2.1rem;
    color: var(--silver-100);
    display: block;
    margin-bottom: 0.8rem;
    text-shadow: 0 0 20px rgba(255, 255, 255, 0.35);
}

.detail-card__title {
    font-family: var(--font-display);
    letter-spacing: 2px;
    color: var(--white);
    margin-bottom: 0.8rem;
    font-size: 1.15rem;
}

.detail-card__text {
    color: var(--silver-300);
    font-size: 1.05rem;
}

/* ---------- RSVP ---------- */
.rsvp__form {
    max-width: 720px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.2rem;
    background: linear-gradient(160deg, var(--black-800), var(--black-700));
    border: 1px solid var(--silver-line);
    border-radius: 16px;
    padding: 2.5rem;
    box-shadow: 0 0 40px rgba(255, 255, 255, 0.06);
}

.field {
    grid-column: 1 / -1;
    display: flex;
    flex-direction: column;
}

.field--half {
    grid-column: span 1;
}

.field label {
    font-family: var(--font-display);
    font-size: 0.8rem;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--silver-200);
    margin-bottom: 0.5rem;
}

.req {
    color: #ff5c8a;
}

.field input,
.field select,
.field textarea {
    font-family: var(--font-body);
    font-size: 1.05rem;
    color: var(--white);
    background: var(--black-950);
    border: 1px solid var(--silver-line);
    border-radius: 8px;
    padding: 0.8rem 1rem;
    transition: border-color 0.2s, box-shadow 0.2s;
    width: 100%;
}

.field input:focus,
.field select:focus,
.field textarea:focus {
    outline: none;
    border-color: var(--silver-100);
    box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.14);
}

.field textarea {
    resize: vertical;
}

.field select option {
    background: var(--black-950);
}

.rsvp__submit {
    grid-column: 1 / -1;
    width: 100%;
    margin-top: 0.5rem;
}

.rsvp__status {
    grid-column: 1 / -1;
    text-align: center;
    font-weight: 600;
    letter-spacing: 1px;
    min-height: 1.4rem;
}

.rsvp__status.is-success {
    color: #4ade80;
}

.rsvp__status.is-error {
    color: #ff5c8a;
}

/* ---------- Footer ---------- */
.footer {
    text-align: center;
    padding: 2.5rem 2rem;
    border-top: 1px solid var(--silver-line);
    color: var(--silver-200);
    background: rgba(10, 13, 16, 0.8);
}

.footer p {
    letter-spacing: 1px;
}

.footer__small {
    color: var(--silver-400);
    font-size: 0.9rem;
    margin-top: 0.4rem;
}

/* ---------- Reveal on scroll ---------- */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.is-visible {
    opacity: 1;
    transform: translateY(0);
}

/* ---------- Responsive ---------- */
@media (max-width: 720px) {
    .nav {
        flex-direction: column;
        gap: 0.8rem;
        padding: 1rem;
    }

    .nav__links {
        gap: 1rem;
        flex-wrap: wrap;
        justify-content: center;
    }

    .rsvp__form {
        grid-template-columns: 1fr;
        padding: 1.6rem;
    }

    .field--half {
        grid-column: 1 / -1;
    }

    section {
        padding: 3.5rem 1.2rem;
    }
}