:root {
    --bg-color: #0f0f13;
    --card-bg: rgba(30, 30, 35, 0.7);
    --input-bg: rgba(45, 45, 50, 0.8);
    --primary: #00d2ff;
    --secondary: #3a7bd5;
    --text-main: #ffffff;
    --text-muted: #aaaaaa;
    --formula-bg: rgba(42, 42, 48, 0.8);
    --fav-color: #ffd700;
    --danger: #ff4b2b;
    
    /* Appearance settings */
    --font-scale: 1;
    --contrast-boost: 0;
}

/* Light mode */
:root.bg-light {
    --bg-color: #f5f5f7;
    --card-bg: rgba(255, 255, 255, 0.85);
    --input-bg: rgba(240, 240, 245, 0.9);
    --text-main: #1a1a1a;
    --text-muted: #555555;
    --formula-bg: rgba(230, 230, 240, 0.9);
}

/* Dim mode */
:root.bg-dim {
    --bg-color: #050508;
    --card-bg: rgba(15, 15, 20, 0.8);
    --input-bg: rgba(20, 20, 25, 0.9);
}

* { 
    box-sizing: border-box; 
    margin: 0; 
    padding: 0; 
    font-family: '-apple-system', BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif; 
}

body {
    background-color: var(--bg-color);
    background-image: 
        radial-gradient(circle at 15% 50%, color-mix(in srgb, var(--primary) 15%, transparent), transparent 40%),
        radial-gradient(circle at 85% 30%, color-mix(in srgb, var(--secondary) 15%, transparent), transparent 40%);
    background-size: 150% 150%;
    animation: pustendeBakgrunn 15s ease-in-out infinite alternate;
    background-attachment: fixed;
    color: var(--text-main);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding-bottom: 50px;
    font-size: calc(16px * var(--font-scale));
    filter: contrast(calc(1 + var(--contrast-boost)));
    transition: background-color 0.3s ease, color 0.3s ease;
}

@keyframes pustendeBakgrunn {
    0% { background-position: 0% 50%; }
    100% { background-position: 100% 50%; }
}

/* --- Header & Logo --- */
.header-container {
    margin-top: 40px;
    text-align: center;
    width: 100%;
}

.header-logo {
    display: block;
    width: 100%;
    border: none;
    background: none;
    cursor: pointer;
    font-size: clamp(2.5rem, 8vw, 3.5rem);
    font-weight: 800;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    text-align: center;
    font-family: inherit;
    outline: none;
}

.author-tag { 
    color: var(--text-muted); 
    margin-bottom: 20px; 
    letter-spacing: 2px; 
    text-transform: uppercase; 
    font-size: 0.8rem; 
}

/* --- Tema-velger --- */
#theme-selector { 
    display: flex; 
    gap: 12px; 
    margin-bottom: 25px; 
    background: rgba(255, 255, 255, 0.05); 
    padding: 10px 20px; 
    border-radius: 30px; 
    border: 1px solid rgba(255, 255, 255, 0.1); 
}

.theme-dot { 
    width: 22px; 
    height: 22px; 
    border-radius: 50%; 
    cursor: pointer; 
    border: 2px solid transparent; 
    transition: 0.3s; 
    padding: 0;
}

.theme-dot.active { 
    border-color: white; 
    transform: scale(1.3); 
    box-shadow: 0 0 10px var(--primary);
}

/* --- Appearance Controls --- */
.appearance-controls {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    margin-bottom: 25px;
    background: rgba(255, 255, 255, 0.05);
    padding: 12px 20px;
    border-radius: 30px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    justify-content: center;
    align-items: center;
}

.separator {
    width: 1px;
    height: 24px;
    background: rgba(255, 255, 255, 0.2);
}

.appearance-btn {
    padding: 8px 14px;
    border-radius: 6px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    background: transparent;
    color: var(--text-main);
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.3s ease;
}

.appearance-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--primary);
}

.appearance-btn.active {
    background: rgba(0, 0, 0, 0.3);
    border-color: var(--primary);
    color: var(--primary);
    box-shadow: 0 0 8px color-mix(in srgb, var(--primary) 40%, transparent);
}

.result-controls {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 15px;
}

.result-controls .action-btn.small {
    padding: 8px 12px;
    font-size: 0.9rem;
}

#explanation-box {
    background: rgba(0, 0, 0, 0.15);
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: 12px;
    padding: 16px;
    margin-top: 12px;
    white-space: pre-wrap;
    line-height: 1.55;
    color: #e8e8e8;
    min-height: 60px;
}

#explanation-box .step-line {
    padding: 4px 0;
    border-bottom: 1px solid rgba(255,255,255,0.08);
}

.learning-controls {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
    align-items: flex-end;
    justify-content: space-between;
    margin-bottom: 16px;
}

.learning-card {
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid rgba(255,255,255,0.12);
    border-radius: 16px;
    padding: 18px;
    min-height: 120px;
    color: #e8e8e8;
    line-height: 1.7;
    margin-bottom: 12px;
}

.learning-score {
    color: #ccc;
    font-size: 0.95rem;
    margin-bottom: 10px;
}

#quiz-hint {
    display: none;
}

#quiz-hint.visible {
    display: block;
}

#learning-panel select,
#learning-panel input {
    background-color: var(--input-bg);
    color: var(--text-main);
}

#learning-panel select {
    border-color: rgba(255,255,255,0.16);
}

#learning-panel select option {
    color: var(--text-main);
    background-color: var(--bg-color);
}

#learning-panel label {
    color: var(--text-muted);
}

#quiz-panel .action-btn {
    flex: 1 1 140px;
}

.action-btn {
    padding: 14px 18px;
    border-radius: 12px;
    border: none;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: #111;
    cursor: pointer;
    transition: transform 0.2s ease, opacity 0.2s ease;
    font-weight: 700;
}

.action-btn:hover {
    transform: translateY(-1px);
}

.action-btn:disabled {
    opacity: 0.45;
    cursor: not-allowed;
    transform: none;
}

/* --- NY LAYOUT: TO KOLONNER --- */
main {
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.hoved-layout {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    width: 100%;
    max-width: 1200px;
    padding: 0 20px;
    align-items: flex-start;
    justify-content: center;
}

.venstre-kolonne {
    flex: 1;
    min-width: 320px;
    max-width: 800px;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.hoyre-kolonne {
    width: 320px;
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.header-btn {
    border: 2px solid rgba(255,255,255,0.18);
    border-radius: 999px;
    background: rgba(255,255,255,0.08);
    color: var(--text-main);
    padding: 10px 18px;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
}

.header-btn:hover,
.header-btn.active {
    background: rgba(255,255,255,0.14);
    border-color: var(--primary);
    color: var(--primary);
}

body.learning-active .hoved-layout {
    justify-content: center;
}

body.learning-active .venstre-kolonne {
    width: 100%;
    max-width: 1200px;
}

body.learning-active .hoyre-kolonne {
    display: none;
}

body.learning-active #learning-view {
    width: 100%;
    max-width: 1200px;
    padding: 40px 20px;
}

body.learning-active #learning-view .learning-card {
    min-height: 260px;
}

.verktoy-boks {
    padding: 20px;
    width: 100%;
}

@media (max-width: 800px) {
    .hoyre-kolonne {
        width: 100%;
        max-width: 800px;
    }
}

/* --- Paneler & Kort --- */
.glass-panel { 
    background-color: var(--card-bg); 
    backdrop-filter: blur(15px); 
    -webkit-backdrop-filter: blur(15px); 
    border: 1px solid rgba(255, 255, 255, 0.1); 
    border-radius: 12px; 
}

#search-container { 
    width: 100%; 
    max-width: 1160px; /* Tilpasset den nye layout-bredden */
    padding: 0 20px; 
    margin-bottom: 20px; 
}

#search-bar { 
    width: 100%; 
    padding: 18px; 
    font-size: 1.1rem; 
    border-radius: 12px; 
    background-color: var(--input-bg); 
    border: 1px solid rgba(255,255,255,0.1); 
    color: white; 
    outline: none; 
}

.grid-container { 
    display: grid; 
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); 
    gap: 15px; 
    width: 100%; 
}

.grid-container > nav {
    grid-column: 1 / -1; /* Span all columns */
    margin-bottom: 15px;
}

.card { 
    padding: 25px; 
    text-align: center; 
    cursor: pointer; 
    transition: 0.3s; 
    font-weight: 600; 
    display: flex; 
    flex-direction: column; 
    align-items: center; 
    justify-content: center; 
    min-height: 120px; 
    position: relative; 
}

.card:hover { 
    transform: translateY(-8px) scale(1.02); 
    background-color: rgba(255, 255, 255, 0.1); 
    border-color: var(--primary); 
    box-shadow: 0 10px 20px rgba(0,0,0,0.3), 0 0 15px color-mix(in srgb, var(--primary) 40%, transparent);
}

.star-btn { 
    position: absolute; 
    top: 10px; 
    right: 10px; 
    font-size: 1.2rem; 
    color: rgba(255,255,255,0.2); 
    background: none; 
    border: none; 
    cursor: pointer; 
    padding: 0;
}

.star-btn.active { 
    color: var(--fav-color); 
}

/* --- Kalkulator-visning --- */
#calc-view { 
    display: none; 
    width: 100%; 
    padding: 30px; 
}

#pre-calc-formula { 
    background-color: var(--formula-bg); 
    border: 1px dashed var(--primary); 
    padding: 15px; 
    text-align: center; 
    border-radius: 8px; 
    margin-bottom: 20px; 
    color: var(--primary); 
    font-family: monospace; 
    font-weight: bold; 
}

input, select { 
    width: 100%; 
    padding: 15px; 
    margin-bottom: 12px; 
    border-radius: 8px; 
    border: 1px solid rgba(255,255,255,0.1); 
    background-color: var(--input-bg); 
    color: white; 
    font-size: 1rem; 
    outline: none; 
}

input:focus, select:focus { 
    border-color: var(--primary); 
}

/* Fjerner stygge piler på tall-inputs */
input[type="number"]::-webkit-inner-spin-button, 
input[type="number"]::-webkit-outer-spin-button { 
    -webkit-appearance: none; 
    margin: 0; 
}
input[type="number"] { -moz-appearance: textfield; }

.action-btn { 
    width: 100%; 
    padding: 16px; 
    border: none; 
    border-radius: 8px; 
    background: linear-gradient(90deg, var(--secondary), var(--primary)); 
    color: white; 
    font-size: 1.1rem; 
    font-weight: bold; 
    cursor: pointer; 
}

.back-btn { 
    background: rgba(255,255,255,0.05); 
    color: var(--text-muted); 
    border: 1px solid rgba(255,255,255,0.1); 
    padding: 10px 18px; 
    border-radius: 8px; 
    cursor: pointer; 
    margin-bottom: 20px; 
    margin-right: 10px; 
}

/* --- Resultater & Graf --- */
#result-container { 
    display: none; 
    margin-top: 25px; 
}

#result-box { 
    padding: 20px; 
    background-color: rgba(0, 210, 255, 0.05); 
    border-left: 4px solid var(--primary); 
    border-radius: 4px; 
    font-size: 1.3rem; 
    font-weight: bold; 
}

#explanation-box { 
    padding: 15px; 
    background-color: rgba(0,0,0,0.2); 
    border-radius: 8px; 
    font-size: 0.95rem; 
    color: #ccc; 
    line-height: 1.6; 
    margin-top: 15px; 
    font-family: monospace; 
    white-space: pre-wrap; 
}

#graph-container { 
    display: none; 
    width: 100%; 
    background: linear-gradient(180deg, rgba(0,0,0,0.96), rgba(15,15,25,0.92)); 
    border: 1px solid rgba(255,255,255,0.14); 
    box-shadow: 0 22px 55px rgba(0,0,0,0.28); 
    border-radius: 14px; 
    overflow: hidden; 
    margin-top: 20px; 
}

canvas { 
    display: block; 
    width: 100%; 
    height: 350px; 
    image-rendering: optimizeQuality; 
}

#graphCanvas {
    cursor: grab;
    touch-action: none; 
    background: transparent;
}

}

#graphCanvas {
    cursor: grab;
    touch-action: none; 
}

#graphCanvas:active {
    cursor: grabbing;
}

/* --- Historikk --- */
.history-item { 
    padding: 12px 0; 
    border-bottom: 1px solid rgba(255,255,255,0.05); 
    display: flex; 
    justify-content: space-between; 
    font-size: 0.95rem;
}

.clear-history { 
    background: none; 
    border: none; 
    color: var(--danger); 
    cursor: pointer; 
    font-size: 0.8rem; 
    font-weight: bold; 
    opacity: 0.7; 
    transition: 0.3s; 
    padding: 5px;
}

.clear-history:hover { 
    opacity: 1; 
}

/* Egendefinert rullefelt for historikken */
#history-list {
    scrollbar-width: thin;
    scrollbar-color: var(--primary) transparent;
}
#history-list::-webkit-scrollbar {
    width: 6px;
}
#history-list::-webkit-scrollbar-thumb {
    background-color: var(--primary);
    border-radius: 10px;
}

/* --- UI Komponenter --- */
#toast { 
    position: fixed; 
    bottom: -50px; 
    left: 50%; 
    transform: translateX(-50%); 
    background: var(--primary); 
    color: #000; 
    padding: 10px 25px; 
    border-radius: 30px; 
    font-weight: bold; 
    transition: 0.4s; 
    z-index: 1000; 
}

#toast.show { 
    bottom: 30px; 
}

.footer { 
    margin-top: 40px; 
    color: rgba(255,255,255,0.2); 
    font-size: 0.8rem; 
    text-align: center;
}

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
}

/* --- DIFFICULTY BUTTONS --- */
.difficulty-btn {
    padding: 8px 15px;
    border-radius: 6px;
    border: 2px solid;
    background: rgba(255, 255, 255, 0.05);
    color: inherit;
    cursor: pointer;
    font-weight: 500;
    transition: all 0.3s ease;
}

.difficulty-btn:hover {
    transform: translateY(-2px);
    opacity: 1;
}

.difficulty-btn.active {
    opacity: 1;
    box-shadow: 0 0 15px currentColor;
}

/* --- LEARNING ANALYTICS STYLES --- */
#practice-status {
    padding: 10px;
    background: rgba(0, 255, 0, 0.1);
    border-radius: 8px;
    margin-bottom: 15px;
    border-left: 4px solid #00ff00;
}

.learning-card {
    word-wrap: break-word;
    overflow-wrap: break-word;
    white-space: normal;
}

/* --- ANIMASJONER OG OVERGANGER --- */
#folder-view, #list-view, #calc-view {
    animation: fadeIn 0.4s cubic-bezier(0.165, 0.84, 0.44, 1);
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(15px); }
    to { opacity: 1; transform: translateY(0); }
}