/* --- THEME VARIABLES --- */
:root {
    /* DARK MODE (Standard) */
    --bg: #0d0015;
    --item-bg: #1a052e;
    --text: #e0d0f5;
    --accent: #d8b4fe;
    --input-bg: #2d0f45;
    --sidebar-bg: #150324;
    --border-color: #331050;
    --danger: #ff453a;
    --chart-grid: #331050;
    --chart-text: #888;
    --modal-bg: #240a3b;
}

body.light-mode {
    /* LIGHT MODE */
    --bg: #f5f0ff;
    --item-bg: #ffffff;
    --text: #2c0b40;
    --accent: #7a3fa3;
    --input-bg: #e8dafa;
    --sidebar-bg: #fbf7ff;
    --border-color: #d0bfff;
    --danger: #d32f2f;
    --chart-grid: #e0e0e0;
    --chart-text: #666;
    --modal-bg: #ffffff;
}

/* --- GLOBAL STYLE --- */
body {
    background-color: var(--bg);
    color: var(--text);
    font-family: 'Inter', sans-serif;
    margin: 0;
    display: flex;
    justify-content: center;
    min-height: 100vh;
    overflow-x: hidden;
    transition: background-color 0.3s, color 0.3s;
}

#auth-screen, #app-screen {
    width: 100%;
    max-width: 600px;
    padding: 15px;
    box-sizing: border-box;
}

/* --- AUTH / LOGIN --- */
.auth-card {
    text-align: center;
    margin-top: 50px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}
.auth-card input {
    width: 100%;
    padding: 15px;
    background: var(--input-bg);
    border: 1px solid var(--border-color);
    color: var(--text);
    box-sizing: border-box;
    border-radius: 8px;
    margin-bottom: 0;
}
.primary-btn {
    width: 100%;
    background: #5b2a8a;
    color: white;
    border: none;
    padding: 15px;
    border-radius: 8px;
    font-weight: bold;
    font-size: 1.1rem;
    cursor: pointer;
}
.primary-btn:hover { background: #6c32a3; }
.secondary-btn {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text);
    padding: 10px;
    border-radius: 5px;
    margin-top: 10px;
    cursor: pointer;
}

/* --- SIDEBAR (SCROLL FIX) --- */
.hamburger-btn {
    background: transparent; border: none; color: var(--text);
    font-size: 1.8rem; cursor: pointer; padding: 0;
}

#sidebar {
    position: fixed; 
    top: 0; 
    left: -280px; 
    width: 260px; 
    height: 100%; /* Volle Höhe */
    background: var(--sidebar-bg); 
    z-index: 1000;
    transition: left 0.3s ease, background-color 0.3s;
    box-shadow: 2px 0 20px rgba(0,0,0,0.2);
    border-right: 1px solid var(--border-color);
    color: var(--text);
    
    /* WICHTIG FÜR SCROLLEN */
    display: flex;
    flex-direction: column;
    overflow-y: auto; /* Scrollbar wenn nötig */
}

#sidebar.open { left: 0; }

.sidebar-content {
    padding: 20px;
    display: flex;
    flex-direction: column;
    /* Damit der Inhalt mindestens so hoch wie der Screen ist, 
       damit margin-top: auto funktioniert */
    min-height: 100%; 
    box-sizing: border-box;
}

#sidebar h2 { margin-top: 0; color: var(--accent); }

#sidebar-overlay {
    position: fixed; top:0; left:0; width:100%; height:100%;
    background: rgba(0,0,0,0.5); z-index: 999; display: none;
}
#sidebar-overlay.active { display: block; }

.sidebar-section { margin-bottom: 25px; border-bottom: 1px solid var(--border-color); padding-bottom: 10px; }
.sidebar-section label { display: block; color: var(--accent); font-size: 0.8rem; margin-bottom: 5px; text-transform: uppercase; font-weight: bold;}
.sidebar-btn {
    display: block; width: 100%; text-align: left; background: transparent;
    border: none; color: var(--text); padding: 12px; font-size: 1rem;
    cursor: pointer; border-radius: 8px; margin-bottom: 5px;
    transition: background-color 0.2s;
    flex-shrink: 0; /* Verhindert, dass Buttons zusammengedrückt werden */
}
.sidebar-btn:hover { background: var(--input-bg); }
.sidebar-btn.active { background: var(--input-bg); color: var(--accent); font-weight: bold; border-left: 4px solid var(--accent);}

/* Logout Button */
.sidebar-btn.logout { 
    color: var(--danger); 
    margin-top: auto; /* Drückt Button nach unten */
    text-align: center; 
    border: 1px solid var(--border-color); 
    margin-bottom: 20px; /* Abstand zum Rand unten beim Scrollen */
}
body.light-mode .sidebar-btn.active { background: #e0d0f5; }

/* --- HEADER --- */
header { margin-bottom: 20px; position: sticky; top: 0; z-index: 10; background: var(--bg); padding-top: 10px; transition: background-color 0.3s;}
.header-top { display: flex; justify-content: space-between; align-items: center; margin-bottom: 15px; }

.term-switch { display: flex; gap: 15px; }
.term-btn { background: transparent; color: var(--text); opacity: 0.6; border: none; font-size: 1.1rem; cursor: pointer; font-weight: bold; transition: opacity 0.3s;}
.term-btn.active { opacity: 1; color: var(--accent); border-bottom: 2px solid var(--accent); }

.circle-container { text-align: center; }
.circle {
    width: 100px; height: 100px; border-radius: 50%; background: var(--item-bg);
    display: flex; align-items: center; justify-content: center; margin: 0 auto;
    font-size: 2.2rem; font-weight: bold; border: 3px solid var(--border-color);
    box-shadow: 0 4px 15px rgba(0,0,0,0.1); transition: all 0.5s;
    color: var(--text);
}
#system-indicator { margin-top: 5px; color: var(--text); opacity: 0.7; font-size: 0.8rem; }

/* --- LISTE --- */
.add-subject-container { display: flex; gap: 10px; margin-bottom: 20px; }
input { flex: 1; background: var(--input-bg); color: var(--text); padding: 12px; border-radius: 8px; border: 1px solid var(--border-color); box-sizing: border-box; transition: background-color 0.3s, color 0.3s;}
.add-subject-container button { background: #5b2a8a; color: white; border: none; padding: 0 20px; border-radius: 8px; font-weight: bold; font-size: 1.5rem; cursor: pointer; }
.add-subject-container button:hover { background: #6c32a3; }

#subjects-list { display: flex; flex-direction: column; gap: 10px; }
.subject-row {
    background: var(--item-bg); padding: 15px; border-radius: 12px;
    display: flex; align-items: center; justify-content: space-between;
    border: 1px solid var(--border-color);
    box-shadow: 0 2px 5px rgba(0,0,0,0.05);
    transition: background-color 0.3s, border-color 0.3s;
}
.subject-info { width: 30%; font-weight: 600; color: var(--accent); word-wrap: break-word; }
.grades-container { flex: 1; display: flex; align-items: center; gap: 6px; flex-wrap: wrap; padding: 0 10px; }

.grade-badge {
    min-width: 34px; height: 34px; padding: 0 5px; border-radius: 6px;
    background: var(--bg); display: flex; align-items: center; justify-content: center;
    font-weight: bold; font-size: 0.95rem; cursor: pointer; border: 1px solid var(--border-color); user-select: none;
    color: var(--text);
}
.grade-badge:hover { background: var(--danger) !important; color: white !important; border-color: var(--danger); }
.grade-badge:hover span { display: none; }
.grade-badge:hover::after { content: "✕"; }

.add-grade-btn {
    width: 32px; height: 32px; border-radius: 50%; background: var(--input-bg);
    color: var(--accent); display: flex; align-items: center; justify-content: center;
    font-size: 1.2rem; cursor: pointer; border: 1px dashed var(--accent);
    transition: background-color 0.3s;
}
.add-grade-btn:hover { background: var(--border-color); }
.subject-avg { width: 45px; text-align: right; font-weight: bold; color: var(--text); }

/* --- MODAL --- */
.modal { display: none; position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: rgba(0,0,0,0.8); z-index: 2000; justify-content: center; align-items: center; }
.modal-content { background: var(--modal-bg); padding: 25px; border-radius: 15px; width: 320px; text-align: center; border: 1px solid var(--border-color); color: var(--text); box-shadow: 0 10px 25px rgba(0,0,0,0.2); transition: background-color 0.3s;}
.modal-content h3 { margin-top: 0; color: var(--accent); }

.grade-base-select { display: grid; grid-template-columns: repeat(6, 1fr); gap: 5px; margin-bottom: 10px; }
.base-btn { padding: 10px 0; background: var(--input-bg); font-size: 1.2rem; color: var(--text); border: 1px solid var(--border-color); border-radius: 5px; cursor: pointer; transition: background-color 0.2s;}
.base-btn:hover { background: var(--border-color); }
.base-btn.selected { background: var(--accent); color: white; border-color: var(--accent); }
.grade-tendency-select { display: flex; gap: 10px; margin-bottom: 15px;}
.tendency-btn { flex: 1; background: var(--input-bg); font-size: 1rem; color: var(--text); border: 1px solid var(--border-color); padding: 10px; border-radius: 5px; cursor: pointer; transition: background-color 0.2s;}
.tendency-btn:hover { background: var(--border-color); }
.cancel-btn { background: transparent; color: var(--text); opacity: 0.7; border: none; width: 100%; padding: 10px; cursor: pointer; }

.points-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; margin-bottom: 15px; }
.point-btn {
    background: var(--input-bg); color: var(--text); border: 1px solid var(--border-color); padding: 12px 0;
    font-size: 1.1rem; border-radius: 6px; cursor: pointer; font-weight: bold; transition: background-color 0.2s;
}
.point-btn:hover { background: var(--accent); color: white; border-color: var(--accent); }

/* --- STATS --- */
.stats-controls { margin-bottom: 15px; }
.stats-controls select { width: 100%; padding: 10px; background: var(--input-bg); border: 1px solid var(--border-color); color: var(--text); border-radius: 8px; transition: background-color 0.3s, color 0.3s; }
.chart-container { height: 350px; background: var(--item-bg); padding: 10px; border-radius: 12px; border: 1px solid var(--border-color); transition: background-color 0.3s, border-color 0.3s; }