/* ── Login Page Styles ────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
    --bg: #0f172a;
    --card: #1e293b;
    --card-border: #334155;
    --primary: #3b82f6;
    --primary-hover: #2563eb;
    --danger: #ef4444;
    --success: #22c55e;
    --text: #f1f5f9;
    --text-muted: #94a3b8;
    --input-bg: #0f172a;
    --radius: 12px;
}

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
}

.login-container {
    width: 100%;
    max-width: 480px;
    padding: 20px;
}

.login-card {
    background: var(--card);
    border: 1px solid var(--card-border);
    border-radius: var(--radius);
    padding: 40px 32px;
    box-shadow: 0 25px 60px rgba(0,0,0,.4);
}

/* Logo */
.logo { text-align: center; margin-bottom: 36px; }
.logo-icon { font-size: 48px; margin-bottom: 8px; }
.logo h1 { font-size: 24px; font-weight: 700; letter-spacing: -.5px; }
.tagline { font-size: 13px; color: var(--text-muted); margin-top: 4px; }

/* Steps */
.step { display: none; }
.step.active { display: block; }

label {
    display: block;
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 8px;
    color: var(--text-muted);
}

/* Email input */
#email-input {
    width: 100%;
    padding: 12px 14px;
    font-size: 15px;
    border: 1px solid var(--card-border);
    border-radius: 8px;
    background: var(--input-bg);
    color: var(--text);
    outline: none;
    transition: border-color .2s;
    font-family: inherit;
}
#email-input:focus { border-color: var(--primary); }

/* Code groups */
.code-group {
    margin-bottom: 16px;
    padding: 14px 16px 12px;
    border: 1px solid var(--card-border);
    border-radius: 10px;
    background: rgba(15, 23, 42, .4);
    transition: border-color .3s, background .3s;
}
.code-group.valid {
    border-color: var(--success);
    background: rgba(34, 197, 94, .06);
}
.code-group.invalid {
    border-color: var(--danger);
    background: rgba(239, 68, 68, .06);
}

.code-group-label {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
}
.code-group-title {
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: .5px;
    color: var(--text-muted);
}
.code-group-status {
    font-size: 12px;
    font-weight: 600;
}
.code-group-status.correct {
    color: var(--success);
}
.code-group-status.wrong {
    color: var(--danger);
}

/* Code boxes */
.code-wrapper {
    display: flex;
    gap: 10px;
    justify-content: center;
}
.digit-box {
    width: 50px;
    height: 58px;
    text-align: center;
    font-size: 26px;
    font-weight: 700;
    border: 2px solid var(--card-border);
    border-radius: 10px;
    background: var(--input-bg);
    color: var(--text);
    outline: none;
    transition: border-color .2s, box-shadow .2s;
    font-family: inherit;
    caret-color: var(--primary);
}
.digit-box:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(59,130,246,.25);
}
.digit-box.error {
    border-color: var(--danger);
    box-shadow: 0 0 0 3px rgba(239,68,68,.2);
    animation: shake .4s;
}
.digit-box.success {
    border-color: var(--success);
    box-shadow: 0 0 0 3px rgba(34,197,94,.2);
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    20%, 60% { transform: translateX(-6px); }
    40%, 80% { transform: translateX(6px); }
}

/* Messages */
.error-msg {
    color: var(--danger);
    font-size: 13px;
    min-height: 20px;
    margin-top: 10px;
    text-align: center;
}
.success-msg {
    color: var(--success);
    font-size: 14px;
    font-weight: 600;
    min-height: 20px;
    margin-top: 10px;
    text-align: center;
}

.user-email-display {
    background: var(--input-bg);
    padding: 8px 12px;
    border-radius: 8px;
    font-size: 13px;
    color: var(--primary);
    text-align: center;
    margin-bottom: 20px;
    border: 1px solid var(--card-border);
    word-break: break-all;
}

/* Buttons */
.btn-primary {
    width: 100%;
    padding: 12px;
    margin-top: 16px;
    font-size: 15px;
    font-weight: 600;
    border: none;
    border-radius: 8px;
    background: var(--primary);
    color: #fff;
    cursor: pointer;
    transition: background .2s, transform .1s;
    font-family: inherit;
}
.btn-primary:hover { background: var(--primary-hover); }
.btn-primary:active { transform: scale(.98); }
.btn-primary:disabled {
    opacity: .5;
    cursor: not-allowed;
}

.btn-secondary {
    width: 100%;
    padding: 10px;
    margin-top: 8px;
    font-size: 13px;
    font-weight: 500;
    border: 1px solid var(--card-border);
    border-radius: 8px;
    background: transparent;
    color: var(--text-muted);
    cursor: pointer;
    transition: background .2s;
    font-family: inherit;
}
.btn-secondary:hover { background: rgba(255,255,255,.05); }

/* Footer */
.login-footer {
    text-align: center;
    margin-top: 24px;
    font-size: 12px;
    color: var(--text-muted);
    opacity: .6;
}

/* Responsive */
@media (max-width: 480px) {
    .login-card { padding: 28px 16px; }
    .digit-box { width: 42px; height: 50px; font-size: 22px; }
    .code-wrapper { gap: 8px; }
    .code-group { padding: 10px 12px 10px; }
}