/* ===== Auth Pages — Shared Styles ===== */
@import url('https://fonts.googleapis.com/css2?family=Lexend+Giga:wght@100..900&family=Lexend+Deca:wght@100..900&display=swap');

:root {
    --purple-dark: #2D2B55;
    --purple-mid: #4A4580;
    --purple-light: #6C63FF;
    --purple-glow: rgba(108, 99, 255, 0.3);
    --accent-orange: #F39C12;
    --accent-green: #2ECC71;
    --error-red: #E74C3C;
    --text-white: #FFFFFF;
    --text-light: rgba(255, 255, 255, 0.7);
    --text-muted: rgba(255, 255, 255, 0.45);
    --glass-bg: rgba(255, 255, 255, 0.08);
    --glass-border: rgba(255, 255, 255, 0.15);
    --glass-bg-hover: rgba(255, 255, 255, 0.12);
    --input-bg: rgba(255, 255, 255, 0.06);
    --input-border: rgba(255, 255, 255, 0.18);
    --input-focus: rgba(108, 99, 255, 0.5);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --shadow-glow: 0 8px 32px rgba(108, 99, 255, 0.2);
    --transition: 0.25s ease;
    --font-display: 'Lexend Giga', sans-serif;
    --font-body: 'Lexend Deca', sans-serif;
}

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

body {
    font-family: var(--font-body);
    background: linear-gradient(135deg, var(--purple-dark) 0%, var(--purple-mid) 50%, #3D3570 100%);
    color: var(--text-white);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    -webkit-font-smoothing: antialiased;
}

/* ===== Auth Container ===== */
.auth-container {
    width: 100%;
    max-width: 460px;
    padding: 24px;
}

/* ===== Logo / Header ===== */
.auth-header {
    text-align: center;
    margin-bottom: 32px;
}

.auth-logo {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: var(--text-white);
    margin-bottom: 8px;
}

.auth-logo-icon {
    font-size: 28px;
}

.auth-logo-text {
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: 700;
    letter-spacing: -0.5px;
}

.auth-title {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    margin-top: 12px;
    letter-spacing: -0.5px;
}

.auth-subtitle {
    font-size: 0.9rem;
    color: var(--text-light);
    margin-top: 6px;
    line-height: 1.5;
}

/* ===== Glass Card ===== */
.auth-card {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-xl);
    padding: 32px 28px;
    box-shadow: var(--shadow-glow);
}

/* ===== Tab Switcher ===== */
.auth-tabs {
    display: flex;
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-md);
    padding: 4px;
    margin-bottom: 24px;
}

.auth-tab {
    flex: 1;
    padding: 10px 16px;
    border: none;
    background: transparent;
    color: var(--text-muted);
    font-family: var(--font-body);
    font-size: 0.85rem;
    font-weight: 600;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition);
}

.auth-tab.active {
    background: var(--purple-light);
    color: var(--text-white);
    box-shadow: 0 2px 8px rgba(108, 99, 255, 0.3);
}

.auth-tab:not(.active):hover {
    color: var(--text-light);
    background: rgba(255, 255, 255, 0.05);
}

/* ===== Forms ===== */
.auth-form {
    display: none;
    flex-direction: column;
    gap: 16px;
}

.auth-form.active {
    display: flex;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.form-label {
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--text-light);
    letter-spacing: 0.5px;
    text-transform: uppercase;
}

.form-input {
    width: 100%;
    background: var(--input-bg);
    border: 1px solid var(--input-border);
    border-radius: var(--radius-md);
    padding: 12px 16px;
    font-family: var(--font-body);
    font-size: 0.95rem;
    color: var(--text-white);
    outline: none;
    transition: border-color var(--transition), box-shadow var(--transition);
}

.form-input::placeholder {
    color: var(--text-muted);
}

/* Select dropdowns */
select.form-input {
    appearance: none;
    -webkit-appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='rgba(255,255,255,0.5)' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 14px center;
    padding-right: 36px;
    cursor: pointer;
}

select.form-input option {
    background: #1a1040;
    color: #fff;
    padding: 8px;
}

.form-input:focus {
    border-color: var(--purple-light);
    box-shadow: 0 0 0 3px var(--input-focus);
}

.form-input.error {
    border-color: var(--error-red);
    box-shadow: 0 0 0 3px rgba(231, 76, 60, 0.25);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

/* ===== Form Hint ===== */
.form-hint {
    font-size: 0.72rem;
    color: var(--text-muted);
    margin-top: 4px;
    line-height: 1.4;
}

/* ===== PIN Input ===== */
.pin-wrapper {
    position: relative;
}

.pin-wrapper .form-input {
    letter-spacing: 8px;
    font-size: 1.2rem;
    text-align: center;
    padding-right: 44px;
}

.pin-toggle {
    position: absolute;
    right: 12px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 1.1rem;
    padding: 4px;
    transition: color var(--transition);
}

.pin-toggle:hover {
    color: var(--text-light);
}

/* ===== PIN boxes ===== */
.pin-boxes {
    display: flex;
    gap: 10px;
    justify-content: center;
}

.pin-box {
    width: 52px;
    height: 60px;
    text-align: center;
    font-size: 1.5rem;
    font-weight: 700;
    border: 2px solid var(--glass-border);
    border-radius: var(--radius);
    background: var(--glass-bg);
    color: var(--text-white);
    font-family: var(--font-body);
    caret-color: var(--purple-light);
    transition: border-color 0.15s ease;
    -moz-appearance: textfield;
}

.pin-box::-webkit-outer-spin-button,
.pin-box::-webkit-inner-spin-button { -webkit-appearance: none; }

.pin-box::placeholder {
    color: rgba(255, 255, 255, 0.18);
}

.pin-box:focus {
    outline: none;
    border-color: var(--purple-light);
    background: rgba(255, 255, 255, 0.08);
}

.pin-box.pin-box-error {
    border-color: #f87171;
}

.pin-hint-label {
    font-size: 0.75rem;
    font-weight: 400;
    color: var(--text-muted);
}

/* ===== Class Code Input ===== */
.class-code-input {
    letter-spacing: 6px;
    font-size: 1.3rem;
    text-align: center;
    text-transform: uppercase;
    font-weight: 700;
}

/* ===== Buttons ===== */
.btn-auth {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 24px;
    border: none;
    border-radius: var(--radius-md);
    font-family: var(--font-body);
    font-size: 0.95rem;
    font-weight: 700;
    cursor: pointer;
    transition: all var(--transition);
    margin-top: 4px;
}

.btn-auth-primary {
    background: linear-gradient(135deg, var(--purple-light), #8B7BFF);
    color: var(--text-white);
    box-shadow: 0 4px 16px rgba(108, 99, 255, 0.35);
}

.btn-auth-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 24px rgba(108, 99, 255, 0.5);
}

.btn-auth-primary:active {
    transform: translateY(0);
}

.btn-auth-primary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.btn-auth-secondary {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    color: var(--text-white);
}

.btn-auth-secondary:hover {
    background: var(--glass-bg-hover);
    transform: translateY(-1px);
}

.btn-auth-orange {
    background: linear-gradient(135deg, #F39C12, #E67E22);
    color: var(--text-white);
    box-shadow: 0 4px 16px rgba(243, 156, 18, 0.35);
}

.btn-auth-orange:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 24px rgba(243, 156, 18, 0.5);
}

.btn-auth-green {
    background: linear-gradient(135deg, #2ECC71, #27AE60);
    color: var(--text-white);
    box-shadow: 0 4px 16px rgba(46, 204, 113, 0.35);
}

.btn-auth-green:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 24px rgba(46, 204, 113, 0.5);
}

/* ===== Spinner ===== */
.spinner {
    width: 18px;
    height: 18px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: var(--text-white);
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
    display: none;
}

.btn-auth.loading .spinner {
    display: block;
}

.btn-auth.loading .btn-text {
    display: none;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ===== Error / Success Messages ===== */
.form-message {
    width: 100%;
    padding: 10px 14px;
    border-radius: var(--radius-sm);
    font-size: 0.82rem;
    font-weight: 500;
    line-height: 1.4;
    overflow-wrap: break-word;
    display: none;
}

.form-message.error {
    display: block;
    background: rgba(231, 76, 60, 0.15);
    border: 1px solid rgba(231, 76, 60, 0.3);
    color: #FF7675;
}

.form-message.success {
    display: block;
    background: rgba(46, 204, 113, 0.15);
    border: 1px solid rgba(46, 204, 113, 0.3);
    color: #55EFC4;
}

/* ===== Divider ===== */
.auth-divider {
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--text-muted);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.auth-divider::before,
.auth-divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--glass-border);
}

/* ===== Links ===== */
.auth-links {
    text-align: center;
    margin-top: 20px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.auth-link {
    color: var(--text-light);
    font-size: 0.82rem;
    text-decoration: none;
    transition: color var(--transition);
}

.auth-link:hover {
    color: var(--text-white);
}

.auth-link strong {
    color: var(--purple-light);
    font-weight: 600;
}

.auth-link strong:hover {
    text-decoration: underline;
}

/* ===== Back Link ===== */
.auth-back {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--text-muted);
    font-size: 0.8rem;
    text-decoration: none;
    margin-bottom: 16px;
    transition: color var(--transition);
}

.auth-back:hover {
    color: var(--text-white);
}

/* ===== Role Picker ===== */
.role-picker {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 8px;
}

.role-card {
    display: flex;
    align-items: center;
    gap: 16px;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: 20px;
    text-decoration: none;
    color: var(--text-white);
    transition: all var(--transition);
    cursor: pointer;
}

.role-card:hover {
    background: var(--glass-bg-hover);
    border-color: var(--purple-light);
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

.role-icon {
    font-size: 2rem;
    flex-shrink: 0;
}

.role-info h3 {
    font-family: var(--font-display);
    font-size: 0.95rem;
    font-weight: 700;
    margin-bottom: 2px;
}

.role-info p {
    font-size: 0.78rem;
    color: var(--text-light);
    line-height: 1.4;
}

/* ===== Entry Cards (login page — student / guest links) ===== */
.auth-entry-cards {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-top: 16px;
}

.entry-card {
    display: flex;
    align-items: center;
    gap: 14px;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: 16px 20px;
    text-decoration: none;
    color: var(--text-white);
    transition: all var(--transition);
}

.entry-card:hover {
    background: var(--glass-bg-hover);
    border-color: var(--purple-light);
    transform: translateY(-1px);
    box-shadow: var(--shadow-glow);
}

.entry-icon {
    font-size: 1.5rem;
    flex-shrink: 0;
}

.entry-info {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.entry-info strong {
    font-family: var(--font-display);
    font-size: 0.88rem;
    font-weight: 700;
}

.entry-info span {
    font-size: 0.75rem;
    color: var(--text-light);
}

/* ===== Responsive ===== */
@media (max-width: 520px) {
    .auth-container {
        padding: 16px;
    }

    .auth-card {
        padding: 24px 20px;
    }

    .auth-title {
        font-size: 1.25rem;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .role-card {
        padding: 16px;
    }

    .role-icon {
        font-size: 1.6rem;
    }
}

/* ===== Accessibility ===== */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        transition-duration: 0.01ms !important;
    }
}

/* ===== Signup Confirmation Panel ===== */
.signup-confirm-panel {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 12px;
    padding: 8px 0;
}

.confirm-icon {
    font-size: 3rem;
    line-height: 1;
    margin-bottom: 4px;
}

.confirm-title {
    font-family: var(--font-display);
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--text-white);
    margin: 0;
}

.confirm-body {
    color: var(--text-light);
    font-size: 0.95rem;
    line-height: 1.6;
    margin: 0;
}

.confirm-body strong {
    color: var(--text-white);
}

.confirm-hint {
    font-size: 0.82rem;
    color: var(--text-muted);
    margin: 0;
}