@import url('https://fonts.googleapis.com/css2?family=Syne:wght@400;600;700&family=Inter:wght@400;500;600&display=swap');

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

:root {
    --bg: #0d0e12;
    --surface: #16181f;
    --surface2: #1e2028;
    --border: rgba(255,255,255,0.08);
    --border-hover: rgba(255,255,255,0.16);
    --text: #f0f0f5;
    --muted: #8a8d9e;
    --accent: #5b7fff;
    --accent-glow: rgba(91,127,255,0.25);
    --accent-dark: #3f5ee6;
    --danger: #ff5c5c;
    --success: #3ecf8e;
    --radius: 12px;
    --font-display: 'Syne', sans-serif;
    --font-body: 'Inter', sans-serif;
}

body {
    font-family: var(--font-body);
    background: var(--bg);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1.5rem;
    position: relative;
    overflow: hidden;
}

/* Background decorative grid */
body::before {
    content: '';
    position: fixed;
    inset: 0;
    background-image:
        linear-gradient(rgba(91,127,255,0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(91,127,255,0.03) 1px, transparent 1px);
    background-size: 48px 48px;
    pointer-events: none;
}

/* Ambient glow orbs */
.orb {
    position: fixed;
    border-radius: 50%;
    filter: blur(80px);
    pointer-events: none;
    z-index: 0;
}
.orb-1 {
    width: 400px; height: 400px;
    background: rgba(91,127,255,0.12);
    top: -100px; left: -100px;
}
.orb-2 {
    width: 300px; height: 300px;
    background: rgba(62,207,142,0.07);
    bottom: -80px; right: -60px;
}

/* Brand bar at top */
.brand-bar {
    position: fixed;
    top: 0; left: 0; right: 0;
    height: 56px;
    display: flex;
    align-items: center;
    padding: 0 2rem;
    border-bottom: 1px solid var(--border);
    z-index: 100;
    backdrop-filter: blur(12px);
    background: rgba(13,14,18,0.7);
}
.brand-logo {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.15rem;
    color: var(--text);
    letter-spacing: -0.02em;
}
.brand-logo span { color: var(--accent); }

/* Main card */
.card {
    position: relative;
    z-index: 10;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 2.5rem 2.25rem 2rem;
    width: 100%;
    max-width: 400px;
    margin-top: 56px;
}

/* Tab switcher */
.tabs {
    display: flex;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 4px;
    gap: 4px;
    margin-bottom: 2rem;
    position: relative;
}
.tab-indicator {
    position: absolute;
    top: 4px;
    height: calc(100% - 8px);
    width: calc(50% - 4px);
    background: var(--accent);
    border-radius: 7px;
    left: 4px;
    transition: left 0.28s cubic-bezier(.4,0,.2,1);
}
.tab-btn {
    flex: 1;
    padding: 9px 0;
    border: none;
    background: transparent;
    font-family: var(--font-body);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    position: relative;
    z-index: 1;
    border-radius: 7px;
    transition: color 0.2s;
    color: var(--muted);
}
.tab-btn.active { color: #fff; }

/* Form wrapper with slide animation */
.slides {
    overflow: hidden;
    position: relative;
}
.form-panel {
    display: flex;
    flex-direction: column;
    gap: 14px;
    position: absolute;
    width: 100%;
    top: 0;
    transition: transform 0.35s cubic-bezier(.4,0,.2,1), opacity 0.25s;
}
#frmlogin { transform: translateX(0); opacity: 1; }
#frmregistrar { transform: translateX(110%); opacity: 0; }

/* Avatar */
.avatar-wrap {
    text-align: center;
    margin-bottom: 4px;
}
.avatar-circle {
    width: 64px;
    height: 64px;
    margin: 0 auto 4px;
    background: var(--surface2);
    border: 2px solid var(--border-hover);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}
.avatar-circle svg {
    width: 32px;
    height: 32px;
    stroke: var(--accent);
    fill: none;
    stroke-width: 1.5;
}
.avatar-label {
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text);
}
.avatar-sub {
    font-size: 12px;
    color: var(--muted);
    margin-top: 2px;
}

/* Field labels */
.field-label {
    font-size: 12px;
    font-weight: 500;
    color: var(--muted);
    text-transform: uppercase;
    letter-spacing: 0.07em;
    margin-bottom: 6px;
    display: block;
}

/* Inputs */
input[type="text"], input[type="password"], input[type="email"] {
    width: 100%;
    padding: 10px 14px;
    background: var(--surface2);
    border: 1px solid var(--border);
    border-radius: 9px;
    font-family: var(--font-body);
    font-size: 14px;
    color: var(--text);
    outline: none;
    transition: border-color 0.2s, box-shadow 0.2s;
}
input[type="text"]:focus,
input[type="password"]:focus,
input[type="email"]:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-glow);
}
input::placeholder { color: #3a3d4d; }

/* Captcha row */
.captcha-row {
    display: flex;
    gap: 8px;
    align-items: center;
}
.captcha-row input { flex: 1; }
.captcha-box {
    font-family: 'Courier New', monospace;
    font-size: 15px;
    font-weight: 700;
    letter-spacing: 4px;
    background: var(--surface2);
    border: 1px solid var(--border);
    color: var(--accent);
    padding: 9px 12px;
    border-radius: 9px;
    cursor: pointer;
    user-select: none;
    white-space: nowrap;
    transition: border-color 0.2s, opacity 0.2s;
    min-width: 90px;
    text-align: center;
}
.captcha-box:hover { border-color: var(--border-hover); opacity: 0.8; }

/* Submit button */
.btn-submit {
    width: 100%;
    padding: 12px;
    background: var(--accent);
    color: #fff;
    border: none;
    border-radius: 10px;
    font-family: var(--font-body);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    margin-top: 4px;
    transition: background 0.2s, transform 0.1s, box-shadow 0.2s;
    letter-spacing: 0.01em;
}
.btn-submit:hover {
    background: var(--accent-dark);
    box-shadow: 0 4px 18px var(--accent-glow);
}
.btn-submit:active { transform: scale(0.98); }

/* Footer links */
.footer-links {
    display: flex;
    justify-content: center;
    gap: 24px;
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border);
}
.footer-link {
    font-size: 12px;
    color: var(--muted);
    text-decoration: none;
    transition: color 0.2s;
}
.footer-link:hover { color: var(--accent); }

@keyframes fadeSlideIn {
    from { opacity: 0; transform: translateY(16px); }
    to   { opacity: 1; transform: translateY(0); }
}
.card { animation: fadeSlideIn 0.4s ease both; }