HTML Form Ifite Animated Border

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
:root {
    --bg: #050508;
    --surface: #0d0d14;
    --gold: #c8a96e;
    --gold-light: #e8c98e;
    --gold-dim: #7a6040;
    --text: #f0ead8;
    --muted: #8a8070;
    --border: rgba(200,169,110,0.2);
}
body {
    font-family: 'DM Sans', sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    overflow-x: hidden;
}
/* Background */
body::before {
    content: '';
    position: fixed;
    inset: 0;
    background:
    radial-gradient(ellipse 80% 60% at 20% 10%, rgba(200,169,110,0.06) 0%, transparent 60%),
    radial-gradient(ellipse 60% 80% at 80% 90%, rgba(100,80,160,0.06) 0%, transparent 60%);
    pointer-events: none;
    z-index: 0;
}
/* ── NAVBAR ── */
nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 40px;
    height: 64px;
    background: rgba(5,5,8,0.7);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    animation: navSlide 0.8s cubic-bezier(0.16,1,0.3,1) both;
}
@keyframes navSlide {
    from { transform: translateY(-100%); opacity: 0; }
    to   { transform: translateY(0);    opacity: 1; }
}
.nav-logo {
    font-family: 'Cormorant Garamond', serif;
    font-size: 1.5rem;
    font-weight: 600;
    letter-spacing: 0.12em;
    color: var(--gold);
    text-transform: uppercase;
}
.nav-links {
    display: flex;
    gap: 36px;
    list-style: none;
}
.nav-links a {
    font-size: 0.82rem;
    font-weight: 300;
    letter-spacing: 0.08em;
    color: var(--muted);
    text-decoration: none;
    text-transform: uppercase;
    transition: color 0.3s;
    position: relative;
}
.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -3px;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--gold);
    transition: width 0.3s ease;
}
.nav-links a:hover { color: var(--gold); }
.nav-links a:hover::after { width: 100%; }
.nav-cta {
    font-size: 0.78rem;
    font-weight: 500;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--bg);
    background: var(--gold);
    padding: 8px 20px;
    border-radius: 2px;
    text-decoration: none;
    transition: background 0.3s, transform 0.2s;
}
.nav-cta:hover {
    background: var(--gold-light);
    transform: translateY(-1px);
}
/* ── MAIN ── */
main {
    position: relative;
    z-index: 1;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 100px 20px 40px;
}
/* ── CARD ── */
.card-wrapper {
    position: relative;
    width: 100%;
    max-width: 440px;
    animation: cardRise 1s cubic-bezier(0.16,1,0.3,1) 0.3s both;
}
@keyframes cardRise {
    from { transform: translateY(30px); opacity: 0; }
    to   { transform: translateY(0);    opacity: 1; }
}
/* Animated border using conic gradient */
.card-border {
    position: absolute;
    inset: -2px;
    border-radius: 6px;
    background: conic-gradient(
    from var(--angle, 0deg),
    transparent 0deg,
    var(--gold) 60deg,
    var(--gold-light) 120deg,
    transparent 180deg,
    transparent 360deg
    );
    animation: rotateBorder 4s linear infinite;
    z-index: -1;
}
@property --angle {
    syntax: '<angle>';
    initial-value: 0deg;
    inherits: false;
}
@keyframes rotateBorder {
    to { --angle: 360deg; }
}
/* Glow behind card */
.card-glow {
    position: absolute;
    inset: -20px;
    border-radius: 20px;
    background: radial-gradient(ellipse at 50% 50%, rgba(200,169,110,0.15), transparent 70%);
    animation: glowPulse 3s ease-in-out infinite alternate;
    z-index: -2;
}
@keyframes glowPulse {
    from { opacity: 0.5; transform: scale(0.95); }
    to   { opacity: 1;   transform: scale(1.05); }
}
.card {
    background: var(--surface);
    border-radius: 5px;
    padding: 48px 44px;
    position: relative;
}
/* ── TABS ── */
.tabs {
    display: flex;
    margin-bottom: 36px;
    border-bottom: 1px solid var(--border);
    gap: 4px;
}
.tab-btn {
    flex: 1;
    padding: 12px;
    background: none;
    border: none;
    cursor: pointer;
    font-family: 'DM Sans', sans-serif;
    font-size: 0.82rem;
    font-weight: 500;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--muted);
    position: relative;
    transition: color 0.3s;
    outline: none;
}
.tab-btn::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--gold);
    transform: scaleX(0);
    transition: transform 0.35s cubic-bezier(0.4,0,0.2,1);
}
.tab-btn.active {
    color: var(--gold);
}
.tab-btn.active::after {
    transform: scaleX(1);
}
/* ── FORMS ── */
.form-panel {
    display: none;
    animation: fadeUp 0.4s ease both;
}
.form-panel.active { display: block; }
@keyframes fadeUp {
    from { opacity: 0; transform: translateY(10px); }
    to   { opacity: 1; transform: translateY(0); }
}
.form-title {
    font-family: 'Cormorant Garamond', serif;
    font-size: 2rem;
    font-weight: 300;
    letter-spacing: 0.04em;
    color: var(--text);
    margin-bottom: 6px;
}
.form-subtitle {
    font-size: 0.82rem;
    color: var(--muted);
    margin-bottom: 32px;
    font-weight: 300;
}
.field {
    margin-bottom: 20px;
    position: relative;
}
label {
    display: block;
    font-size: 0.72rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--muted);
    margin-bottom: 8px;
    font-weight: 500;
}
input {
    width: 100%;
    background: rgba(255,255,255,0.03);
    border: 1px solid rgba(200,169,110,0.15);
    border-radius: 3px;
    padding: 13px 16px;
    font-family: 'DM Sans', sans-serif;
    font-size: 0.92rem;
    font-weight: 300;
    color: var(--text);
    transition: border-color 0.3s, box-shadow 0.3s, background 0.3s;
    outline: none;
}
input::placeholder { color: #3a3530; }
input:focus {
    border-color: var(--gold);
    background: rgba(200,169,110,0.04);
    box-shadow: 0 0 0 3px rgba(200,169,110,0.08);
}
/* Floating label line effect */
.field::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 1px;
    background: var(--gold);
    transition: width 0.4s ease;
}
.field:focus-within::after { width: calc(100% - 2px); }
.row-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 14px;
}
.forgot {
    display: block;
    text-align: right;
    font-size: 0.74rem;
    color: var(--gold-dim);
    text-decoration: none;
    margin-top: -10px;
    margin-bottom: 24px;
    transition: color 0.3s;
}
.forgot:hover { color: var(--gold); }
.btn-submit {
    width: 100%;
    padding: 15px;
    background: var(--gold);
    color: var(--bg);
    border: none;
    border-radius: 3px;
    font-family: 'DM Sans', sans-serif;
    font-size: 0.82rem;
    font-weight: 500;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    cursor: pointer;
    position: relative;
    overflow: hidden;
    transition: background 0.3s, transform 0.2s, box-shadow 0.3s;
    margin-top: 8px;
}
.btn-submit::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: rgba(255,255,255,0.2);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    transition: width 0.5s ease, height 0.5s ease;
}
.btn-submit:active::before {
    width: 300px;
    height: 300px;
}
.btn-submit:hover {
    background: var(--gold-light);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(200,169,110,0.25);
}
.divider {
    display: flex;
    align-items: center;
    gap: 14px;
    margin: 24px 0;
    color: var(--muted);
    font-size: 0.72rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}
.divider::before, .divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--border);
}
.social-row {
    display: flex;
    gap: 10px;
}
.social-btn {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 11px;
    background: rgba(255,255,255,0.03);
    border: 1px solid var(--border);
    border-radius: 3px;
    color: var(--muted);
    font-family: 'DM Sans', sans-serif;
    font-size: 0.78rem;
    font-weight: 400;
    letter-spacing: 0.06em;
    cursor: pointer;
    transition: all 0.3s;
    text-decoration: none;
}
.social-btn:hover {
    border-color: var(--gold-dim);
    color: var(--text);
    background: rgba(200,169,110,0.05);
}
/* Corner accents on card */
.card::before, .card::after {
    content: '';
    position: absolute;
    width: 20px;
    height: 20px;
    border-color: var(--gold);
    border-style: solid;
    opacity: 0.4;
}
.card::before {
    top: 12px; left: 12px;
    border-width: 1px 0 0 1px;
}
.card::after {
    bottom: 12px; right: 12px;
    border-width: 0 1px 1px 0;
}
/* ── PARTICLES ── */
.particles {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 0;
    overflow: hidden;
}
.particle {
    position: absolute;
    width: 2px;
    height: 2px;
    background: var(--gold);
    border-radius: 50%;
    opacity: 0;
    animation: float var(--dur) var(--delay) ease-in-out infinite;
}
@keyframes float {
    0%   { transform: translateY(100vh) translateX(0); opacity: 0; }
    10%  { opacity: 0.4; }
    90%  { opacity: 0.1; }
    100% { transform: translateY(-10vh) translateX(var(--drift)); opacity: 0; }
}
.terms {
    font-size: 0.7rem;
    color: var(--muted);
    text-align: center;
    margin-top: 18px;
    line-height: 1.6;
}
.terms a {
    color: var(--gold-dim);
    text-decoration: none;
    transition: color 0.3s;
}
.terms a:hover { color: var(--gold); }

// Tab switch
function switchTab(panel, btn) {
    document.querySelectorAll('.form-panel').forEach(p => p.classList.remove('active'));
    document.querySelectorAll('.tab-btn').forEach(b => b.classList.remove('active'));
    document.getElementById(panel).classList.add('active');
    btn.classList.add('active');
}
// Particles
const container = document.getElementById('particles');
for (let i = 0; i < 28; i++) {
    const p = document.createElement('div');
    p.className = 'particle';
    const x = Math.random() * 100;
    const drift = (Math.random() - 0.5) * 120;
    const dur = 8 + Math.random() * 12;
    const delay = Math.random() * 14;
    p.style.cssText = `
    left: ${x}%;
    --dur: ${dur}s;
    --delay: -${delay}s;
    --drift: ${drift}px;
    width: ${1 + Math.random() * 2}px;
    height: ${1 + Math.random() * 2}px;
    opacity: ${0.2 + Math.random() * 0.5};
    `;
    container.appendChild(p);
}