/* Authentication Pages Styling */

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Landing Page */
.landing-page {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.landing-container {
    max-width: 1200px;
    width: 90%;
    margin: 0 auto;
    padding: 40px 20px;
}

.landing-header {
    text-align: center;
    color: white;
    margin-bottom: 60px;
}

.landing-header h1 {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 10px;
}

.landing-header .subtitle {
    font-size: 1.2rem;
    opacity: 0.9;
}

.login-options {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
    margin-bottom: 40px;
}

.login-option {
    background: white;
    border-radius: 12px;
    padding: 40px 30px;
    text-align: center;
    text-decoration: none;
    color: #333;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.login-option .option-icon {
    font-size: 4rem;
    margin-bottom: 20px;
}
.login-option .option-icon svg {
    width: 4rem;
    height: 4rem;
    display: inline-block;
    vertical-align: middle;
}

.login-option h2 {
    font-size: 1.8rem;
    margin-bottom: 10px;
    color: #667eea;
}

.login-option p {
    color: #666;
    font-size: 1rem;
}

.landing-footer {
    text-align: center;
    color: white;
    margin-top: 40px;
}

.landing-footer a {
    color: white;
    text-decoration: underline;
    font-weight: 600;
}

/* Auth Container */
.auth-container {
    background: white;
    border-radius: 12px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
    max-width: 500px;
    width: 90%;
    padding: 40px;
}

.auth-header {
    text-align: center;
    margin-bottom: 30px;
}

.auth-header h1 {
    color: #667eea;
    font-size: 2rem;
    margin-bottom: 10px;
}

.auth-header p {
    color: #666;
    font-size: 0.95rem;
}

.auth-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

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

.form-group label {
    color: #333;
    font-weight: 600;
    margin-bottom: 8px;
    font-size: 0.9rem;
}

.form-group input,
.form-group select {
    padding: 12px 15px;
    border: 2px solid #e2e8f0;
    border-radius: 6px;
    font-size: 1rem;
    transition: border-color 0.3s;
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: #667eea;
}

.form-group input[type="checkbox"] {
    width: auto;
    margin-right: 8px;
}

.checkbox-group {
    display: flex;
    align-items: center;
    flex-direction: row;
}

.checkbox-group label {
    margin-bottom: 0;
    font-weight: normal;
}

/* Tabs */
.tabs {
    display: flex;
    border-bottom: 2px solid #e2e8f0;
    margin-bottom: 20px;
}

.tab {
    flex: 1;
    padding: 12px;
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    color: #666;
    transition: color 0.3s;
}

.tab.active {
    color: #667eea;
    border-bottom: 3px solid #667eea;
    margin-bottom: -2px;
}

.tab:hover {
    color: #667eea;
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

/* Buttons */
.btn {
    padding: 14px 20px;
    border: none;
    border-radius: 6px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    text-align: center;
    text-decoration: none;
    display: inline-block;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.4);
}

.btn-primary:disabled {
    background: #cbd5e0;
    cursor: not-allowed;
    transform: none;
}

.btn-secondary {
    background: #e2e8f0;
    color: #333;
}

.btn-secondary:hover {
    background: #cbd5e0;
}

/* Alerts */
.alert {
    padding: 12px 15px;
    border-radius: 6px;
    margin-bottom: 20px;
    font-size: 0.95rem;
}

.alert-error {
    background: #fed7d7;
    color: #c53030;
    border: 1px solid #fc8181;
}

.alert-success {
    background: #c6f6d5;
    color: #2f855a;
    border: 1px solid #9ae6b4;
}

.alert-info {
    background: #bee3f8;
    color: #2c5282;
    border: 1px solid #90cdf4;
}

/* Links */
.auth-links {
    text-align: center;
    margin-top: 20px;
}

.auth-links a {
    color: #667eea;
    text-decoration: none;
    font-weight: 600;
}

.auth-links a:hover {
    text-decoration: underline;
}

/* Password Strength Indicator */
.password-strength {
    height: 4px;
    border-radius: 2px;
    margin-top: 5px;
    transition: all 0.3s;
}

.password-strength.weak {
    width: 33%;
    background: #fc8181;
}

.password-strength.medium {
    width: 66%;
    background: #f6ad55;
}

.password-strength.strong {
    width: 100%;
    background: #48bb78;
}

/* Password Display (for teacher viewing student passwords) */
.password-display {
    background: #f7fafc;
    border: 2px dashed #667eea;
    border-radius: 6px;
    padding: 20px;
    text-align: center;
    margin: 20px 0;
}

.password-display .password-label {
    font-size: 0.9rem;
    color: #666;
    margin-bottom: 10px;
}

.password-display .password-value {
    font-size: 2rem;
    font-weight: 700;
    color: #667eea;
    font-family: 'Courier New', monospace;
    letter-spacing: 0.1em;
}

.password-display .copy-btn {
    margin-top: 15px;
    padding: 8px 20px;
    background: #667eea;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.9rem;
}

.password-display .copy-btn:hover {
    background: #5568d3;
}

/* Loading Spinner */
.spinner {
    border: 3px solid #f3f3f3;
    border-top: 3px solid #667eea;
    border-radius: 50%;
    width: 20px;
    height: 20px;
    animation: spin 1s linear infinite;
    display: inline-block;
    margin-right: 10px;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Responsive */
@media (max-width: 768px) {
    .landing-header h1 {
        font-size: 2.5rem;
    }

    .login-options {
        grid-template-columns: 1fr;
    }

    .auth-container {
        padding: 30px 20px;
    }
}

/* Back button centered at bottom of form */
.auth-back {
    text-align: center;
    margin-top: 24px;
    padding-top: 20px;
    border-top: 1px solid #e2e8f0;
}

.auth-back .btn {
    min-width: 160px;
}

/* BIPES-aligned login and chooser pages */
.landing-page,
.login-page {
    --bipes-panel: rgba(255, 255, 255, 0.86);
    --bipes-border: rgba(68, 153, 204, 0.18);
    --bipes-text: #1f2937;
    --bipes-muted: #64748b;
    --bipes-accent: #4499cc;
    --bipes-accent-hot: #267ba8;
    --bipes-focus-ring: rgba(38, 123, 168, 0.4);
    --bipes-green: #48bb78;
    --bipes-page-bg: #fff;
    --bipes-shadow: rgba(68, 153, 204, 0.12);
    --bipes-shadow-strong: rgba(68, 153, 204, 0.18);
    --bipes-input-bg: rgba(255, 255, 255, 0.76);
    --bipes-input-border: rgba(68, 153, 204, 0.22);
    --bipes-placeholder: rgba(31, 41, 55, 0.42);
    --bipes-secondary-bg: rgba(255, 255, 255, 0.75);
    --bipes-secondary-hover: rgba(68, 153, 204, 0.08);
    --bipes-secondary-text: #334155;
    --bipes-divider: rgba(68, 153, 204, 0.14);
    --bipes-status-bg: rgba(255, 255, 255, 0.94);
    --bipes-primary-bg: linear-gradient(135deg, #4499cc 0%, #54beff 100%);
    --teacher-card-bg: linear-gradient(180deg, rgba(229, 246, 255, 0.96), rgba(214, 239, 252, 0.82)), #e5f6ff;
    --student-card-bg: linear-gradient(180deg, rgba(239, 247, 255, 0.96), rgba(225, 240, 255, 0.82)), #eff7ff;
    --guest-card-bg: linear-gradient(180deg, rgba(236, 253, 245, 0.96), rgba(220, 252, 231, 0.82)), #ecfdf5;
    --guest-card-border: rgba(72, 187, 120, 0.26);
    background: var(--bipes-page-bg);
    color-scheme: light;
    color: var(--bipes-text);
    font-family: 'OpenSans', 'Segoe UI', sans-serif;
    overflow-x: hidden;
    overflow-y: auto;
}

.landing-page::before,
.login-page::before {
    display: none;
}

.landing-container {
    max-width: 1040px;
    position: relative;
    z-index: 1;
}

.landing-header {
    margin-bottom: 2.2rem;
}

.auth-logo {
    display: block;
    height: 4.5rem;
    margin: 0 auto 1rem;
    width: 4.5rem;
}

.landing-header h1 {
    color: var(--bipes-text);
    font-size: clamp(2rem, 5vw, 3.4rem);
    letter-spacing: -0.035em;
    line-height: 1;
}

.landing-header .subtitle {
    color: var(--bipes-muted);
    font-size: 1rem;
    margin: 0.9rem auto 0;
    max-width: 34rem;
}

.login-options {
    gap: 1rem;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    margin-bottom: 0;
}

.login-option {
    border: 1px solid var(--bipes-border);
    border-radius: 1.15rem;
    box-shadow: 0 1rem 2.5rem var(--bipes-shadow);
    color: var(--bipes-text);
    min-height: 13rem;
    padding: 1.5rem;
    position: relative;
    text-align: center;
}

.login-option:hover,
.login-option:focus-visible {
    border-color: var(--bipes-accent);
    outline: 2px solid var(--bipes-focus-ring);
    outline-offset: 0.2rem;
}

.login-option .option-icon {
    align-items: center;
    display: inline-flex;
    font-size: 3.4rem;
    height: 4rem;
    justify-content: center;
    margin-bottom: 1.4rem;
    width: 4rem;
}

.login-option h2 {
    color: var(--bipes-text);
    font-size: 1.35rem;
    letter-spacing: -0.02em;
}

.login-option p {
    color: var(--bipes-muted);
    line-height: 1.45;
    margin-top: 0.5rem;
}

.teacher-option {
    background: var(--teacher-card-bg);
}

.student-option {
    background: var(--student-card-bg);
}

.guest-option {
    background: var(--guest-card-bg);
    border-color: var(--guest-card-border);
}

.login-page .auth-container {
    background:
        linear-gradient(180deg, rgba(255,255,255,0.96), rgba(255,255,255,0.84)),
        var(--bipes-panel);
    border: 1px solid var(--bipes-border);
    border-radius: 1.15rem;
    box-shadow: 0 1rem 2.8rem var(--bipes-shadow);
    max-width: 28rem;
    padding: 2rem;
    position: relative;
    z-index: 1;
}

.login-page .auth-header h1 {
    color: var(--bipes-accent-hot);
    font-size: 1.8rem;
    letter-spacing: -0.03em;
}

.login-page .auth-header p,
.login-page .auth-links p {
    color: var(--bipes-muted);
}

.login-page .form-group label {
    color: var(--bipes-text);
}

.login-page .form-group input,
.login-page .form-group select {
    background: var(--bipes-input-bg);
    border: 1px solid var(--bipes-input-border);
    color: var(--bipes-text);
}

.login-page .form-group input::placeholder {
    color: var(--bipes-placeholder);
}

.login-page .form-group input:focus,
.login-page .form-group select:focus {
    border-color: var(--bipes-accent-hot);
    box-shadow: 0 0 0 0.2rem rgba(84, 190, 255, 0.12);
}

.login-page .btn {
    border-radius: 0.55rem;
}

.login-page .btn-primary {
    background: var(--bipes-primary-bg);
    border: 1px solid rgba(38, 123, 168, 0.35);
    color: #fff;
}

.login-page .btn:hover,
.login-page .btn:focus-visible {
    box-shadow: none;
    outline: 2px solid var(--bipes-focus-ring);
    outline-offset: 0.18rem;
    transform: none;
}

.login-page .btn-secondary {
    background: var(--bipes-secondary-bg);
    border: 1px solid var(--bipes-divider);
    color: var(--bipes-secondary-text);
}

.login-page .btn-secondary:hover {
    background: var(--bipes-secondary-hover);
}

.login-page .auth-links a {
    color: var(--bipes-accent-hot);
}

.login-page .auth-back {
    border-top: 1px solid var(--bipes-divider);
}

#status-bar.auth-status-bar {
    font-size: 0.9rem;
    height: 1.5rem;
    position: fixed;
    right: 0;
    text-align: right;
    top: calc(100vh - 1.5rem);
    width: calc(100vw - 3.5rem);
    box-shadow: 0 0 .25em rgba(0,0,0,.25);
    display: flex;
    justify-content: space-between;
    background: var(--bipes-status-bg);
    border-top: 1px solid var(--bipes-border);
    bottom: auto;
    left: auto;
    z-index: 5;
}

#status-bar.auth-status-bar #globals {
    display: inline-block;
    min-width: 5rem;
    height: 1.5rem;
}

#status-bar.auth-status-bar select {
    border-radius: 0;
    padding: 0;
    border: none;
    opacity: 0;
    width: 6rem;
    position: absolute;
}

#status-bar.auth-status-bar button.status-icon,
#status-bar.auth-status-bar span.status-icon {
    padding: .125rem .25rem;
    cursor: pointer;
    transition: background-color ease .125s;
    -webkit-tap-highlight-color: transparent;
    display: inline-flex;
    align-items: center;
    background-color: rgba(68,153,204,0);
    color: var(--bipes-text);
    border: 0;
    font: inherit;
    min-height: 1.5rem;
    position: relative;
    text-decoration: none;
}

#status-bar.auth-status-bar button.status-icon:before,
#status-bar.auth-status-bar span.status-icon:before {
    display: inline-block;
    width: 1.25rem;
    height: 1.25rem;
    background: url('../media/icons.svg');
    background-size: auto 2.5rem;
    content: '';
    margin: 0;
    flex-shrink: 0;
    margin-right: .125rem;
}

#status-bar.auth-status-bar #extra button,
#status-bar.auth-status-bar #extra span {
    opacity: 0.8;
}

#status-bar.auth-status-bar #extra button:hover,
#status-bar.auth-status-bar #extra span:hover {
    opacity: 1;
}

#status-bar.auth-status-bar span.status-icon:hover,
#status-bar.auth-status-bar span.status-icon:focus,
#status-bar.auth-status-bar button.status-icon:hover,
#status-bar.auth-status-bar button.status-icon:focus {
    background-color: rgba(68,153,204,.5);
    outline: none;
}

#status-bar.auth-status-bar span#language select {
    cursor: pointer;
}

#status-bar.auth-status-bar button#forum:before,
div#status-bar button#forum:before {
    background-position: left calc(-1.25rem*45) top;
}

#status-bar.auth-status-bar span#language:before,
div#status-bar span#language:before {
    background-position: left calc(-1.25rem*46) top;
}

#status-bar.auth-status-bar button#theme:before,
div#status-bar button#theme:before {
    background-position: left calc(-1.25rem*47) top !important;
}

#status-bar.auth-status-bar button.on#theme:before,
div#status-bar button.on#theme:before {
    background-position: left calc(-1.25rem*47) bottom !important;
}

.landing-page.light #status-bar.auth-status-bar button.status-icon:before,
.landing-page.light #status-bar.auth-status-bar span#language:before,
.login-page.light #status-bar.auth-status-bar button.status-icon:before,
.login-page.light #status-bar.auth-status-bar span#language:before {
    filter: invert(1);
}

#status-bar.auth-status-bar #extra {
    display: inline-block;
}

#status-bar.auth-status-bar #language select {
    cursor: pointer;
}

.landing-page.dark,
.login-page.dark {
    --bipes-panel: rgba(51, 51, 51, 0.94);
    --bipes-border: rgba(125, 211, 252, 0.2);
    --bipes-text: #fff;
    --bipes-muted: #cbd5e1;
    --bipes-accent-hot: #7dd3fc;
    --bipes-focus-ring: rgba(125, 211, 252, 0.72);
    --bipes-page-bg: #222;
    --bipes-shadow: rgba(0, 0, 0, 0.28);
    --bipes-shadow-strong: rgba(0, 0, 0, 0.34);
    --bipes-input-bg: rgba(0, 0, 0, 0.18);
    --bipes-input-border: rgba(125, 211, 252, 0.24);
    --bipes-placeholder: rgba(255, 255, 255, 0.45);
    --bipes-secondary-bg: rgba(255, 255, 255, 0.08);
    --bipes-secondary-hover: rgba(255, 255, 255, 0.14);
    --bipes-secondary-text: #fff;
    --bipes-divider: rgba(255, 255, 255, 0.12);
    --bipes-status-bg: rgba(34, 34, 34, 0.96);
    --teacher-card-bg: linear-gradient(180deg, rgba(28, 64, 82, 0.98), rgba(28, 52, 66, 0.92)), #1c4052;
    --student-card-bg: linear-gradient(180deg, rgba(33, 58, 88, 0.98), rgba(30, 48, 70, 0.92)), #213a58;
    --guest-card-bg: linear-gradient(180deg, rgba(28, 71, 52, 0.98), rgba(27, 58, 44, 0.92)), #1c4734;
    --guest-card-border: rgba(72, 187, 120, 0.36);
    color-scheme: dark;
}

.landing-page.dark select,
.login-page.dark select {
    background-color: #222;
    color: #fff;
}

.landing-page.dark select option,
.login-page.dark select option {
    background-color: #222;
    color: #fff;
}

.landing-page.dark select option:checked,
.login-page.dark select option:checked {
    background-color: var(--bipes-accent);
    color: #fff;
}

.login-page.dark .auth-container {
    background:
        linear-gradient(180deg, rgba(51, 51, 51, 0.98), rgba(42, 42, 42, 0.94)),
        #333;
}

@media screen and (max-width:39.99rem) {
    /* Keep the language + theme switcher reachable on phones. */
    #status-bar.auth-status-bar {
        width: 100vw;
        height: auto;
        top: auto;
        bottom: 0;
        flex-wrap: wrap;
        justify-content: flex-end;
    }
    #status-bar.auth-status-bar #globals {
        display: none;
    }
}

@media (max-width: 768px) {
    .login-options {
        grid-template-columns: 1fr;
    }

    .login-option {
        min-height: auto;
    }
}