@import url('https://fonts.googleapis.com/css2?family=Orbitron:wght@400;700;900&family=Nunito:wght@300;400;600;700&display=swap');

:root {
    --primary: #2563eb;
    --primary-dark: #1e40af;
    --primary-light: #3b82f6;
    --accent: #22c55e;
    --bg-dark: #0f0e1a;
    --bg-card: #1a1830;
    --bg-input: #231f3a;
    --text-main: #f1f0ff;
    --text-muted: #9ca3af;
    --border: #2e2b4a;
    --success: #22c55e;
    --error: #ef4444;
}

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

    /* Floating particles */
.particles {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 0;
    overflow: hidden;
}
.particle {
    position: absolute;
    width: 4px;
    height: 4px;
    background: var(--primary-light);
    border-radius: 50%;
    opacity: 0.4;
    animation: float linear infinite;
}
@keyframes float {
    from { transform: translateY(100vh) rotate(0deg); opacity: 0; }
    10%  { opacity: 0.4; }
    90%  { opacity: 0.4; }
    to   { transform: translateY(-100px) rotate(720deg); opacity: 0; }
}

body {
    background: var(--bg-dark);
    font-family: 'Nunito', sans-serif;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow-x: hidden;
    padding: 40px 16px;
}

body::before {
    content: '';
    position: fixed;
    inset: 0;
    background:
        radial-gradient(ellipse at 20% 50%, rgba(79,70,229,0.12) 0%, transparent 60%),
        radial-gradient(ellipse at 80% 20%, rgba(245,158,11,0.07) 0%, transparent 50%);
    pointer-events: none;
    z-index: 0;
}

.container {
    position: relative;
    z-index: 1;
    background: var(--bg-card);
    padding: 48px 40px;
    border-radius: 20px;
    border: 1px solid var(--border);
    box-shadow: 0 25px 60px rgba(0,0,0,0.5), inset 0 1px 0 rgba(255,255,255,0.05);
    width: 100%;
    max-width: 460px;
    animation: slideUp 0.5s cubic-bezier(0.16,1,0.3,1) both;
}

@keyframes slideUp {
    from { opacity: 0; transform: translateY(30px); }
    to   { opacity: 1; transform: translateY(0); }
}

.logo-area { text-align: center; margin-bottom: 32px; }
.logo-icon {
    width: 60px; height: 60px;
    background: #ffffff;
    border-radius: 16px;
    display: flex; align-items: center; justify-content: center;
    font-size: 26px;
    margin: 0 auto 14px;
    box-shadow: 0 8px 24px rgba(79,70,229,0.4);
    overflow: hidden;
}
.logo-icon img { width: 100%; height: 100%; object-fit: contain; padding: 8px; display: block; }
h2 {
    font-family: 'Orbitron', sans-serif;
    color: var(--text-main);
    font-size: 20px;
    font-weight: 700;
    letter-spacing: 1px;
}
.subtitle { color: var(--text-muted); font-size: 13px; margin-top: 6px; }

.form-group { margin-bottom: 18px; position: relative; }

label {
    display: block;
    margin-bottom: 7px;
    color: var(--text-muted);
    font-weight: 600;
    font-size: 12px;
    letter-spacing: 0.5px;
    text-transform: uppercase;
}

.input-wrapper { position: relative; }

input[type="text"],
input[type="email"],
input[type="password"] {
    width: 100%;
    padding: 13px 44px 13px 44px;
    background: var(--bg-input);
    border: 1.5px solid var(--border);
    border-radius: 10px;
    font-size: 14px;
    color: var(--text-main);
    font-family: 'Nunito', sans-serif;
    transition: border-color 0.25s, box-shadow 0.25s;
}
input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(79,70,229,0.2);
}
input.valid   { border-color: var(--success) !important; }
input.invalid { border-color: var(--error)   !important; }

.input-icon {
    position: absolute; left: 14px; top: 50%;
    transform: translateY(-50%);
    font-size: 15px; pointer-events: none;
}
.input-status {
    position: absolute; right: 12px; top: 50%;
    transform: translateY(-50%);
    font-size: 14px; pointer-events: none;
    transition: opacity 0.2s;
}
.password-toggle + .input-status {
    right: 48px;
}
.password-toggle {
    position: absolute;
    right: 12px;
    top: 50%;
    transform: translateY(-50%);
    width: 28px;
    height: 28px;
    border: 0;
    border-radius: 8px;
    background: transparent;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 15px;
    line-height: 1;
}
.password-toggle:hover,
.password-toggle:focus {
    color: var(--text-main);
    outline: none;
    background: rgba(255,255,255,0.06);
}
.input-status.ok   { color: var(--success); }
.input-status.fail { color: var(--error); }
.input-status.spin { color: var(--text-muted); animation: spin 0.8s linear infinite; display: inline-block; }
@keyframes spin { to { transform: translateY(-50%) rotate(360deg); } }

.field-hint {
    font-size: 12px; margin-top: 5px; min-height: 14px; transition: color 0.2s;
}
.field-hint.ok   { color: var(--success); }
.field-hint.fail { color: var(--error); }
.field-hint.info { color: var(--text-muted); }

.strength-bar  { height: 4px; border-radius: 2px; background: var(--border); margin-top: 8px; overflow: hidden; }
.strength-fill { height: 100%; border-radius: 2px; transition: width 0.3s, background 0.3s; width: 0%; }

/* Password requirements checklist */
.pw-reqs {
    margin-top: 8px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4px;
}
.pw-req {
    font-size: 11px;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 4px;
    transition: color 0.2s;
}
.pw-req.met { color: var(--success); }
.pw-req .check { font-size: 12px; }

button[type="submit"] {
    width: 100%; padding: 15px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white; border: none; border-radius: 10px;
    font-size: 15px; font-weight: 700; font-family: 'Nunito', sans-serif;
    cursor: pointer; letter-spacing: 0.5px;
    transition: transform 0.2s, box-shadow 0.2s, opacity 0.2s;
    margin-top: 8px;
}
button[type="submit"]:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(79,70,229,0.45);
}
button[type="submit"]:disabled { opacity: 0.5; cursor: not-allowed; }

.link { margin-top: 22px; color: var(--text-muted); font-size: 14px; text-align: center; }
.link a { color: var(--primary-light); text-decoration: none; font-weight: 700; }
.link a:hover { color: var(--accent); }

.alert { padding: 12px 16px; border-radius: 10px; margin-bottom: 20px; font-size: 14px; font-weight: 600; display: flex; align-items: center; gap: 8px; }
.alert-error   { background: rgba(239,68,68,0.1); color: #fca5a5; border: 1px solid rgba(239,68,68,0.3); }
.alert-success { background: rgba(16,185,129,0.1); color: #6ee7b7; border: 1px solid rgba(16,185,129,0.3); }

/* Light Mode */
body.light-mode {
    --bg-dark: #ffffff;
    --bg-card: #ffffff;
    --bg-input: #f8fafc;
    --text-main: #111827;
    --text-muted: #64748b;
    --border: #94a3b8;
}

body.light-mode::before {
    background:
        radial-gradient(ellipse at 20% 50%, rgba(37,99,235,0.08) 0%, transparent 60%),
        radial-gradient(ellipse at 80% 20%, rgba(34,197,94,0.05) 0%, transparent 50%);
}

body.light-mode .container {
    box-shadow: 0 18px 42px rgba(15,23,42,0.14);
}

body.light-mode input:focus {
    background: #ffffff;
    box-shadow: 0 0 0 3px rgba(37,99,235,0.15);
}

body.light-mode .alert-error {
    background: rgba(239,68,68,0.08);
    color: #dc2626;
    border-color: rgba(239,68,68,0.2);
}

body.light-mode .alert-success {
    background: rgba(34,197,94,0.08);
    color: #16a34a;
    border-color: rgba(34,197,94,0.2);
}