:root {
    --primary-green: #7fda55;
    --primary-green-dark: #5cb536;
    --primary-red: #e74c3c;
    --text-dark: #1a1a1a;
    --text-gray: #666666;
    --text-light: #999999;
    --bg-white: #ffffff;
    --bg-light: #f8f9fa;
    --border-dark: #1a1a1a;
    --border-light: #e0e0e0;
    --shadow-card: 4px 4px 0 #1a1a1a;
    --shadow-card-hover: 6px 6px 0 #1a1a1a;
    --shadow-button: 3px 3px 0 #1a1a1a;
    --shadow-button-hover: 4px 4px 0 #1a1a1a;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background: var(--bg-white);
    color: var(--text-dark);
    line-height: 1.7;
    overflow-x: hidden;
}

a {
    color: inherit;
    text-decoration: none;
}

#teacher-page,
#student-page,
.error-page {
    min-height: 100vh;
    padding: 32px 24px;
}

.container,
.student-container {
    width: 100%;
    max-width: 960px;
    margin: 0 auto;
}

.header {
    text-align: center;
    margin: 24px auto 16px;
}

.header h1 {
    font-size: 2.2rem;
    font-weight: 800;
    letter-spacing: 1px;
    margin-bottom: 8px;
    color: var(--text-dark);
}

.header p {
    font-size: 1rem;
    color: var(--text-gray);
}

.bauhaus-shapes {
    display: none;
}

.config-card {
    background: var(--bg-white);
    border: 2px solid var(--border-dark);
    border-radius: 16px;
    padding: 20px 18px 18px;
    box-shadow: var(--shadow-card);
}

.config-card form {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 8px 24px;
    align-items: flex-start;
}

.form-section {
    margin-bottom: 8px;
}

.section-title {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 16px;
    padding-left: 10px;
    border-left: 4px solid var(--primary-green);
}

.form-group {
    margin-bottom: 12px;
}

.form-group label {
    display: block;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-gray);
    margin-bottom: 6px;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 10px 12px;
    border-radius: 10px;
    border: 2px solid var(--border-dark);
    font-size: 0.95rem;
    font-family: inherit;
    background: var(--bg-light);
    transition: all 0.2s ease;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    background: var(--bg-white);
    box-shadow: 0 0 0 2px var(--primary-green);
}

.form-group textarea {
    min-height: 96px;
    resize: vertical;
}

.form-group small {
    display: block;
    margin-top: 4px;
    font-size: 0.8rem;
    color: var(--text-light);
}

.btn-generate {
    width: auto;
    min-width: 220px;
    padding: 14px 28px;
    margin-top: 4px;
    border-radius: 12px;
    border: 2px solid var(--border-dark);
    background: var(--primary-green);
    color: var(--text-dark);
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
    box-shadow: var(--shadow-button);
    transition: all 0.2s ease;
}

.generate-actions {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 12px;
    margin-top: 4px;
}

.btn-help {
    padding: 10px 16px;
    border-radius: 10px;
    border: 2px solid var(--border-dark);
    background: var(--bg-white);
    color: var(--text-dark);
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    box-shadow: var(--shadow-button);
    transition: all 0.2s ease;
}

.btn-help:hover {
    transform: translate(-1px, -1px);
    box-shadow: var(--shadow-button-hover);
}

.btn-generate:hover {
    transform: translate(-2px, -2px);
    box-shadow: var(--shadow-button-hover);
}

.result-section {
    margin-top: 20px;
    padding: 18px 16px;
    border-radius: 14px;
    border: 2px solid var(--border-dark);
    background: var(--bg-light);
    box-shadow: var(--shadow-card);
    display: none;
}

.result-section.show {
    display: block;
}

.result-title {
    font-size: 0.95rem;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--text-dark);
}

.link-display {
    background: #1e1e1e;
    color: #f5f5f5;
    padding: 10px 12px;
    border-radius: 8px;
    border: 1px solid #000000;
    font-family: SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
    font-size: 0.8rem;
    word-break: break-all;
    margin-bottom: 12px;
}

.btn-copy {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 18px;
    border-radius: 10px;
    border: 2px solid var(--border-dark);
    background: var(--bg-white);
    color: var(--text-dark);
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    box-shadow: var(--shadow-button);
    transition: all 0.2s ease;
}

.btn-copy + .btn-copy {
    margin-left: 10px;
}

.btn-copy:hover {
    transform: translate(-1px, -1px);
    box-shadow: var(--shadow-button-hover);
}

.btn-copy:nth-of-type(2) {
    background: var(--primary-green);
}

#student-page {
    background: var(--bg-light);
}

.student-header {
    background: var(--bg-white);
    border-radius: 18px;
    border: 2px solid var(--border-dark);
    padding: 28px 22px 22px;
    box-shadow: var(--shadow-card);
    margin-bottom: 20px;
}

.student-title {
    font-size: 1.8rem;
    font-weight: 800;
    margin-bottom: 8px;
    color: var(--text-dark);
}

.student-subtitle {
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--primary-green-dark);
    margin-bottom: 16px;
}

.student-description {
    font-size: 0.95rem;
    color: var(--text-gray);
    padding: 12px 14px;
    border-radius: 10px;
    border: 1px dashed var(--border-light);
    background: var(--bg-light);
}

.chat-tip {
    margin-top: 24px;
    padding: 14px 16px;
    border-radius: 14px;
    border: 2px dashed var(--border-dark);
    background: var(--bg-white);
    box-shadow: var(--shadow-card);
    font-size: 0.98rem;
    font-weight: 600;
    text-align: center;
}

.chat-tip::before {
    content: "💬";
    display: inline-block;
    margin-right: 8px;
}

.error-page {
    display: none;
    background: var(--bg-light);
    align-items: center;
    justify-content: center;
}

.error-content {
    background: var(--bg-white);
    border-radius: 16px;
    border: 2px solid var(--border-dark);
    padding: 32px 26px;
    text-align: center;
    box-shadow: var(--shadow-card);
}

.error-content h2 {
    font-size: 1.4rem;
    margin-bottom: 12px;
    color: #e74c3c;
}

.access-denied-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.3);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 9999;
}

.access-shapes {
    display: none;
}

.access-denied-container {
    background: var(--bg-white);
    border-radius: 16px;
    border: 2px solid var(--border-dark);
    padding: 28px 24px 22px;
    max-width: 420px;
    width: 90%;
    text-align: center;
    box-shadow: var(--shadow-card);
}

.access-icon {
    width: 72px;
    height: 72px;
    border-radius: 50%;
    margin: 0 auto 16px;
    border: 2px solid var(--border-dark);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    background: var(--primary-green);
}

.access-denied-container h2 {
    font-size: 1.4rem;
    font-weight: 800;
    margin-bottom: 10px;
}

.access-denied-container p {
    font-size: 0.95rem;
    color: var(--text-gray);
    margin-bottom: 18px;
}

.countdown-box {
    padding: 14px 12px;
    border-radius: 12px;
    border: 2px dashed var(--border-dark);
    background: var(--bg-light);
    margin-bottom: 16px;
}

.countdown-time {
    font-size: 0.95rem;
    font-weight: 700;
    margin-bottom: 6px;
}

.countdown-number {
    color: var(--primary-green-dark);
}

.countdown-desc {
    font-size: 0.86rem;
    color: var(--text-gray);
}

.btn-redirect {
    margin-top: 6px;
    padding: 10px 20px;
    border-radius: 10px;
    border: 2px solid var(--border-dark);
    background: var(--primary-green);
    color: var(--text-dark);
    font-size: 0.95rem;
    font-weight: 700;
    cursor: pointer;
    box-shadow: var(--shadow-button);
    transition: all 0.2s ease;
}

.btn-redirect:hover {
    transform: translate(-1px, -1px);
    box-shadow: var(--shadow-button-hover);
}

.official-link {
    margin-top: 14px;
    padding-top: 10px;
    border-top: 1px solid var(--border-light);
}

.official-link p {
    font-size: 0.82rem;
    color: var(--text-light);
}

.official-link a {
    color: var(--primary-green-dark);
    font-weight: 600;
}

.loading {
    display: inline-block;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    border: 2px solid rgba(0, 0, 0, 0.12);
    border-top-color: rgba(0, 0, 0, 0.6);
    animation: spin 0.8s linear infinite;
}

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

@media (max-width: 768px) {
    #teacher-page,
    #student-page,
    .error-page {
        padding: 24px 16px;
    }

    .header {
        margin-top: 24px;
    }

    .header h1 {
        font-size: 1.7rem;
    }

    .config-card {
        padding: 18px 16px 16px;
        border-radius: 14px;
    }

    .config-card form {
        grid-template-columns: 1fr;
        gap: 4px 0;
    }

    .student-header {
        border-radius: 16px;
        padding: 22px 18px 18px;
    }
}

@media (max-width: 480px) {
    .header h1 {
        font-size: 1.5rem;
    }

    .generate-actions {
        flex-direction: column;
        gap: 8px;
    }

    .btn-generate {
        width: 100%;
    }

    .btn-copy {
        width: 100%;
        margin-bottom: 8px;
    }

    .btn-copy + .btn-copy {
        margin-left: 0;
    }

    .student-title {
        font-size: 1.5rem;
    }
}