:root {
    --bg: #07131c;
    --bg-soft: #102535;
    --panel: rgba(7, 27, 40, 0.78);
    --border: rgba(133, 174, 197, 0.32);
    --text: #ecf4fb;
    --muted: #aac0cf;
    --accent: #ffb347;
    --accent-2: #3ad7c4;
    --danger: #ff6f5e;
    --shadow: 0 24px 60px rgba(0, 0, 0, 0.36);
}

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

body {
    min-height: 100vh;
    background: radial-gradient(circle at 12% 18%, rgba(255, 179, 71, 0.2), transparent 42%),
        radial-gradient(circle at 84% 0%, rgba(58, 215, 196, 0.2), transparent 38%),
        linear-gradient(160deg, var(--bg) 0%, #0a2232 48%, #0d1f2a 100%);
    color: var(--text);
    font-family: "Sora", sans-serif;
}

.ambient {
    position: fixed;
    inset: 0;
    pointer-events: none;
    background-image: linear-gradient(rgba(255, 255, 255, 0.035) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.035) 1px, transparent 1px);
    background-size: 42px 42px;
    mask-image: radial-gradient(circle at center, black 45%, transparent 100%);
}

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(7, 19, 28, 0.88);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
    height: 64px;
    display: flex;
    align-items: center;
}

.nav-logo {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text);
    text-decoration: none;
}

.nav-logo span {
    color: var(--accent);
}

.auth-wrapper {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 100px 1.5rem 3rem;
    position: relative;
    z-index: 1;
}

.auth-card {
    width: 100%;
    max-width: 420px;
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 2rem;
    backdrop-filter: blur(12px);
    box-shadow: var(--shadow);
    animation: rise 0.5s ease;
}

.tab-header {
    display: flex;
    gap: 0;
    margin-bottom: 1.75rem;
    border-bottom: 1px solid var(--border);
}

.tab-btn {
    flex: 1;
    background: none;
    border: none;
    color: var(--muted);
    font-family: "Sora", sans-serif;
    font-size: 0.95rem;
    font-weight: 600;
    padding: 0.75rem 0;
    cursor: pointer;
    position: relative;
    transition: color 0.2s;
}

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

.tab-btn.active {
    color: var(--text);
}

.tab-btn.active::after {
    content: "";
    position: absolute;
    bottom: -1px;
    left: 15%;
    right: 15%;
    height: 2px;
    background: var(--accent);
    border-radius: 1px;
}

.auth-form {
    display: grid;
    gap: 1rem;
}

.form-group {
    display: grid;
    gap: 0.35rem;
}

.form-group label {
    font-size: 0.85rem;
    color: var(--muted);
    font-weight: 600;
}

.form-group input {
    width: 100%;
    padding: 0.7rem 0.9rem;
    border-radius: 12px;
    border: 1px solid var(--border);
    background: rgba(6, 17, 24, 0.8);
    color: var(--text);
    font-family: "Sora", sans-serif;
    font-size: 0.9rem;
}

.form-group input:focus {
    outline: 2px solid rgba(58, 215, 196, 0.6);
    outline-offset: 2px;
}

.form-error {
    background: rgba(255, 111, 94, 0.15);
    border: 1px solid rgba(255, 111, 94, 0.4);
    border-radius: 10px;
    padding: 0.6rem 0.8rem;
    color: var(--danger);
    font-size: 0.85rem;
}

.form-success {
    background: rgba(88, 208, 142, 0.15);
    border: 1px solid rgba(88, 208, 142, 0.4);
    border-radius: 10px;
    padding: 0.6rem 0.8rem;
    color: #58d08e;
    font-size: 0.85rem;
}

.btn-submit {
    background: linear-gradient(120deg, var(--accent), #f17a52);
    color: #1a130e;
    font-size: 0.95rem;
    font-weight: 700;
    padding: 0.8rem;
    border-radius: 12px;
    border: none;
    cursor: pointer;
    font-family: "Sora", sans-serif;
    transition: transform 0.2s, filter 0.2s;
}

.btn-submit:hover {
    transform: translateY(-1px);
    filter: brightness(1.05);
}

.hidden {
    display: none;
}

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