/* =============================================
   SKS Board - Main Styles (Global/Shared)
   ============================================= */

/* Core Reset & Design Tokens */
* { margin: 0; padding: 0; box-sizing: border-box; }

:root {
    /* Colors */
    --color-bg: #ffffff;
    --color-bg-alt: #f8f9fa;
    --color-surface: #ffffff;
    --color-border: #e5e7eb;
    --color-border-strong: #d1d5db;
    --color-text: #1f2937;
    --color-text-light: #6b7280;
    --color-text-muted: #9ca3af;
    
    /* Shadows */
    --shadow-sm: 0 2px 10px rgba(0,0,0,0.08);
    
    /* Colors - Teacher (Red Theme) */
    --accent-start: #dc3545;
    --accent-end: #c82333;
    --accent-hover-start: #c82333;
    --accent-hover-end: #bd2130;
    
    /* Colors - Student (Blue Theme) */
    --student-accent: #17a2b8;
    --student-accent-hover: #138496;
    
    /* Secondary */
    --secondary-bg: #f8f9fa;
    --secondary-border: #e9ecef;
    --secondary-hover-bg: #e9ecef;
    
    /* Border Radius */
    --radius-xs: 4px;
    --radius-s: 6px;
    --radius-m: 8px;
    --radius-l: 12px;
    --radius-xl: 16px;
    --radius-pill: 999px;
    
    /* Spacing */
    --space-1: .25rem;
    --space-2: .5rem;
    --space-3: .75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-xs: .7rem;
    --font-size-s: .85rem;
    --font-size-base: .95rem;
    --font-size-m: 1rem;
    --font-size-l: 1.3rem;
    --font-size-xl: 1.5rem;
    --font-size-xxl: 2.5rem;
    
    /* Transitions */
    --transition-fast: .15s ease;
    --transition: .3s ease;
}

/* Base Styles */
body {
    font-family: var(--font-family);
    line-height: 1.6;
    color: var(--color-text);
    background: var(--color-bg-alt);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    margin-bottom: var(--space-4);
    color: var(--color-text);
}

h1 { font-size: var(--font-size-xxl); }
h2 { font-size: var(--font-size-xl); }
h3 { font-size: var(--font-size-l); }

/* =============================================
   GLOBAL HEADER (Used by all pages)
   ============================================= */
.header {
    padding: 2rem 0 1rem 0;
    width: 100%;
    background: var(--color-surface);
    box-shadow: var(--shadow-sm);
    border-bottom: 1px solid var(--color-border);
}

.header-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    text-align: center;
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--space-8);
    width: 100%;
}

.header h1 {
    font-size: var(--font-size-xxl);
    font-weight: 600;
    color: var(--color-text);
    margin: 0;
}

/* =============================================
   USER TYPE BADGES
   ============================================= */
.user-type {
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-pill);
    font-size: var(--font-size-s);
    font-weight: 500;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

/* Teacher Badge */
.user-type.teacher {
    background: var(--accent-start);
    color: white;
}

/* Student Badge */
.user-type.student {
    background: var(--student-accent);
    color: white;
}

/* Default Badge */
.user-type:not(.teacher):not(.student) {
    background: var(--student-accent);
    color: white;
}

/* =============================================
   BUTTONS (Global Button System)
   ============================================= */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-3) var(--space-6);
    border: none;
    border-radius: var(--radius-m);
    font-size: var(--font-size-base);
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition);
    gap: var(--space-2);
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-start) 0%, var(--accent-end) 100%);
    color: white;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-3) var(--space-6);
    border: none;
    border-radius: var(--radius-m);
    font-size: var(--font-size-base);
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition);
    gap: var(--space-2);
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--accent-hover-start) 0%, var(--accent-hover-end) 100%);
    transform: translateY(-1px);
}

.btn-secondary {
    background: var(--secondary-bg);
    color: var(--color-text);
    border: 1px solid var(--secondary-border);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-3) var(--space-6);
    border-radius: var(--radius-m);
    font-size: var(--font-size-base);
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition);
    gap: var(--space-2);
}

.btn-secondary:hover {
    background: var(--secondary-hover-bg);
    border-color: var(--color-border-strong);
}

/* =============================================
   FORMS (Global Form System)
   ============================================= */
.form-group {
    margin-bottom: var(--space-5);
}

.form-group label {
    display: block;
    margin-bottom: var(--space-2);
    font-weight: 500;
    color: var(--color-text);
}

.required-indicator {
        color: #dc3545;
        margin-left: 0.25rem;
        font-weight: 600;
}

.form-info {
        font-size: var(--font-size-s);
        color: var(--color-text-light);
        background: var(--secondary-bg);
        border: 1px dashed var(--secondary-border);
        border-radius: var(--radius-s);
        padding: var(--space-2) var(--space-3);
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: var(--space-3) var(--space-4);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-m);
    font-size: var(--font-size-base);
    transition: var(--transition-fast);
    background: var(--color-surface);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--accent-start);
    box-shadow: 0 0 0 3px rgba(220, 53, 69, 0.1);
}

.form-hint {
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
    margin-top: var(--space-1);
}

/* =============================================
   LANDING PAGE BUTTON STYLES
   ============================================= */
.role-card .card-action span {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-3) var(--space-6);
    border: none;
    border-radius: var(--radius-m);
    font-size: var(--font-size-base);
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition);
    gap: var(--space-2);
    text-align: center;
}

/* Teacher card button (red) */
.role-card[href="teacher/"] .card-action span {
    background: linear-gradient(135deg, var(--accent-start) 0%, var(--accent-end) 100%);
    color: white;
}

/* Student card button (blue) */
.role-card[href="student/"] .card-action span {
    background: var(--secondary-bg);
    color: var(--color-text);
    border: 1px solid var(--secondary-border);
}

/* =============================================
   CUSTOM ADMIN BUTTON STYLES
   ============================================= */
#addTeacherBtn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-4);
    background: linear-gradient(135deg, #ff9500 0%, #ff7b00 100%);
    color: white;
    border: none;
    border-radius: var(--radius-m);
    font-size: var(--font-size-s);
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition-fast);
    text-decoration: none;
    white-space: nowrap;
    box-shadow: var(--shadow-sm);
}

.modal-footer button[type="submit"] {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-4);
    background: linear-gradient(135deg, #ff9500 0%, #ff7b00 100%);
    color: white;
    border: none;
    border-radius: var(--radius-m);
    font-size: var(--font-size-s);
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition-fast);
    text-decoration: none;
    white-space: nowrap;
    box-shadow: var(--shadow-sm);
    text-align: center;
}

.modal-footer button[onclick="deleteTeacher()"] {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-4);
    background: #ffebee;
    color: #c62828;
    border: 1px solid #ffcdd2;
    border-radius: var(--radius-m);
    font-size: var(--font-size-s);
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition-fast);
    text-decoration: none;
    white-space: nowrap;
    text-align: center;
}

/* =============================================
   UNIVERSAL BUTTON FIX - FORCE VISIBILITY
   ============================================= */
.btn, 
.btn-primary, 
.btn-secondary, 
.btn-warning, 
.btn-danger, 
.btn-success,
button[class*="btn"],
.modal-footer button,
.admin-section button {
    display: inline-flex !important;
    opacity: 1 !important;
    visibility: visible !important;
    position: relative !important;
    z-index: auto !important;
}

/* =============================================
   MODALS (Global Modal System)
   ============================================= */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    display: none;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.modal.show {
    display: flex;
}

.modal-content {
    background: var(--color-surface);
    border-radius: var(--radius-xl);
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.15);
    max-width: 500px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    /* Hide scrollbar */
    scrollbar-width: none; /* Firefox */
    -ms-overflow-style: none; /* IE/Edge */
}

/* Hide scrollbar for WebKit browsers (Chrome, Safari) */
.modal-content::-webkit-scrollbar {
    display: none;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-6) var(--space-6) 0;
    border-bottom: 1px solid var(--color-border);
    margin-bottom: var(--space-6);
}

.modal-header h3 {
    margin: 0;
    font-size: var(--font-size-l);
}

.modal-close {
    background: none;
    border: none;
    font-size: var(--font-size-xl);
    cursor: pointer;
    color: var(--color-text-light);
    padding: var(--space-2);
}

.modal-close:hover {
    color: var(--color-text);
}

.modal-body {
    padding: 0 var(--space-6) var(--space-6);
}

.modal-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem;
    border-top: 1px solid var(--color-border);
    gap: 1rem;
    background: var(--color-surface);
}

.action-buttons-left {
    display: flex;
    gap: 0.75rem;
    align-items: center;
}

.action-buttons-right {
    display: flex;
    gap: 0.75rem;
    align-items: center;
    margin-left: auto;
}

.checkbox-row {
    display: flex;
    gap: 2rem;
    margin-top: 1rem;
}

/* Button styles */
.btn {
    display: inline-flex !important;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.25rem;
    border: 1px solid;
    border-radius: var(--radius-m);
    font-size: var(--font-size-s);
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    text-decoration: none;
    white-space: nowrap;
    opacity: 1 !important;
    visibility: visible !important;
    position: relative;
    z-index: 1;
    background-clip: padding-box;
}

.btn:hover {
    /* No hover effect */
}

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

.btn-primary {
    background: var(--color-primary);
    color: white;
    border-color: var(--color-primary);
}

.btn-primary:hover {
    /* No hover effect */
}

.btn-secondary {
    background: var(--color-surface);
    color: var(--color-text);
    border-color: var(--color-border);
}

.btn-secondary:hover {
    /* No hover effect */
}

.btn-warning {
    background: #ff9800;
    color: white;
    border-color: #ff9800;
}

.btn-warning:hover {
    /* No hover effect */
}

.btn-danger {
    background: var(--color-error);
    color: white;
    border-color: var(--color-error);
}

.btn-danger:hover {
    /* No hover effect */
}

.btn-success {
    background: var(--color-success);
    color: white;
    border-color: var(--color-success);
}

.btn-success:hover {
    /* No hover effect */
}

/* =============================================
   FOOTER (Global Footer)
   ============================================= */
.footer {
    background: var(--color-surface);
    border-top: 1px solid var(--color-border);
    padding: var(--space-6) 0;
    margin-top: auto;
}

.footer-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--space-8);
    text-align: center;
}

.footer-content p {
    margin: 0;
    color: var(--color-text-light);
    font-size: var(--font-size-s);
}

/* =============================================
   LANDING PAGE STYLES
   ============================================= */
.landing-page {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-8);
}

.landing-content {
    width: 100%;
    max-width: 800px;
}

.role-selection {
    text-align: center;
}

.role-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-8);
    margin-top: var(--space-8);
}

.role-card {
    display: block;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--space-8);
    text-decoration: none;
    color: inherit;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
}

.role-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
    border-color: var(--color-border-strong);
}

.role-icon {
    font-size: 3rem;
    margin-bottom: var(--space-4);
}

.role-card h3 {
    font-size: var(--font-size-l);
    margin-bottom: var(--space-3);
}

.role-card p {
    color: var(--color-text-light);
    margin-bottom: var(--space-6);
}

.card-action {
    margin-top: var(--space-4);
}

/* =============================================
   PLUS BUTTON (Used in Teacher Pages)
   ============================================= */
.add-project-btn {
    position: fixed;
    bottom: max(1.5rem, env(safe-area-inset-bottom) + 1rem);
    right: calc(max(1.5rem, env(safe-area-inset-right) + 1rem) - 100px);
    width: 64px;
    min-width: 64px;
    height: 64px;
    min-height: 64px;
    padding: 0;
    background: linear-gradient(135deg, var(--accent-start) 0%, var(--accent-end) 100%);
    color: white;
    border: none;
    border-radius: 50%;
    font-size: 2rem;
    font-weight: 300;
    cursor: pointer;
    box-shadow: 0 4px 15px rgba(220, 53, 69, 0.3);
    transition: var(--transition);
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    line-height: 0;
}

.add-project-btn:hover {
    background: linear-gradient(135deg, var(--accent-hover-start) 0%, var(--accent-hover-end) 100%);
    transform: translateY(-2px) scale(1.05);
    box-shadow: 0 8px 25px rgba(220, 53, 69, 0.4);
}

.add-project-btn:disabled,
.add-project-btn.disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.add-project-btn:disabled:hover,
.add-project-btn.disabled:hover {
    transform: none;
    box-shadow: none;
}

/* =============================================
   PROJECTS GRID (Teacher Main Page)
   ============================================= */
.main {
    flex: 1;
    padding: var(--space-8);
    min-height: calc(100vh - 200px);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--space-6);
    max-width: 1200px;
    margin: 0 auto;
}

.project-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--space-6);
    transition: var(--transition);
    cursor: pointer;
    box-shadow: var(--shadow-sm);
}

.project-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
    border-color: var(--accent-start);
}

.project-card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: var(--space-4);
    margin-bottom: var(--space-4);
}

.project-card-header h4 {
    margin: 0;
    font-size: var(--font-size-l);
    font-weight: 600;
    color: var(--color-text);
}

.project-status {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.25rem 0.65rem;
    border-radius: 999px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    background: var(--secondary-bg);
    color: var(--color-text-light);
}

.project-status-aktiv {
    background: rgba(25, 135, 84, 0.12);
    color: #198754;
}

.project-status-archiviert {
    background: rgba(108, 117, 125, 0.12);
    color: #6c757d;
}

.project-status-entwurf {
    background: rgba(13, 110, 253, 0.12);
    color: #0d6efd;
}

.project-status-abgeschlossen {
    background: rgba(255, 193, 7, 0.12);
    color: #b58100;
}

.project-card-body {
    display: grid;
    gap: 0.5rem;
    color: var(--color-text-light);
    font-size: 0.95rem;
}

.project-card-body strong {
    color: var(--color-text);
}

.project-card-footer {
    margin-top: var(--space-6);
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--space-4);
}

.project-card-footer .btn-secondary {
    cursor: pointer;
}

.project-card.loading,
.project-card.error {
    text-align: center;
    color: var(--color-text-light);
    cursor: default;
}

.project-card.error {
    background: rgba(220, 53, 69, 0.06);
    border-color: rgba(220, 53, 69, 0.3);
    color: #842029;
}

/* =============================================
   EMPTY STATE
   ============================================= */
.empty-state {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    min-height: 400px;
    text-align: center;
    padding: var(--space-8);
    width: 100%;
    flex: 1;
}

.empty-content {
    max-width: 400px;
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-4);
}

.empty-icon {
    font-size: 4rem;
    opacity: 0.5;
}

.empty-content h2,
.empty-content h3 {
    color: var(--color-text-light);
    margin: 0;
}

.empty-content p {
    color: var(--color-text-muted);
    margin: 0;
}

.empty-content .btn-primary {
    margin-top: var(--space-2);
}

/* =============================================
   RESPONSIVE DESIGN
   ============================================= */
@media (max-width: 768px) {
    .header {
        padding: 1rem 0;
    }
    
    .header h1 {
        font-size: var(--font-size-xl);
    }
    
    .role-cards {
        grid-template-columns: 1fr;
        gap: var(--space-6);
    }
    
    .landing-page,
    .main {
        padding: var(--space-4);
    }
    
    .add-project-btn {
        bottom: max(1rem, env(safe-area-inset-bottom) + 0.75rem);
        right: calc(max(1rem, env(safe-area-inset-right) + 0.75rem) - 80px);
        width: 54px;
        min-width: 54px;
        height: 54px;
        min-height: 54px;
        font-size: 1.6rem;
    }
    
    .projects-grid {
        grid-template-columns: 1fr;
        gap: var(--space-4);
    }
}

/* =============================================
   ADMIN LINK IN HEADER
   ============================================= */
.header-content {
    position: relative;
}

.header-main {
    text-align: center;
}

.header-admin {
    position: absolute;
    top: 0;
    right: 0;
    padding: var(--space-4);
}

.admin-link {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-4);
    background: var(--secondary-bg);
    border: 1px solid var(--secondary-border);
    border-radius: var(--radius-m);
    color: var(--color-text-light);
    text-decoration: none;
    font-size: var(--font-size-s);
    font-weight: 500;
    transition: var(--transition-fast);
}

.admin-link:hover {
    background: var(--secondary-hover-bg);
    color: var(--color-text);
    border-color: var(--color-border-strong);
}

@media (max-width: 768px) {
    .header-admin {
        position: static;
        padding: var(--space-2) 0 0 0;
        text-align: center;
    }
    
    .header-content {
        flex-direction: column;
        gap: var(--space-3);
    }
}