/* Modern stilren design för Ines Matte */

:root {
    --bg: #f1f5f9;
    --bg-alt: #ffffff;
    --border: #e2e8f0;
    --border-strong: #cbd5e1;
    --text: #0f172a;
    --text-muted: #64748b;
    --primary: #6366f1;
    --primary-accent: #4f46e5;
    --success: #16a34a;
    --danger: #ef4444;
    --warning: #f59e0b;
    --radius-sm: 6px;
    --radius: 12px;
    --radius-lg: 18px;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.06);
    --shadow: 0 4px 12px rgba(0,0,0,0.06);
    --gradient: linear-gradient(135deg, #6366f1, #4f46e5);
    font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Arial', sans-serif;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    background: var(--bg);
    color: var(--text);
    -webkit-font-smoothing: antialiased;
    line-height: 1.4;
    padding: 24px;
}

.app-shell {
    max-width: 1220px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.app-header {
    text-align: center;
    padding: 12px 0 8px;
}

.app-header h1 {
    font-size: clamp(1.9rem, 4vw, 2.6rem);
    background: var(--gradient);
    -webkit-background-clip: text;
    color: transparent;
    margin: 0 0 4px;
    font-weight: 700;
    letter-spacing: -1px;
}

.tagline {
    margin: 0;
    color: var(--text-muted);
    font-size: 0.95rem;
    font-weight: 500;
}

.mode-selector {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 14px 20px;
}

.mode-label {
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-muted);
    font-weight: 600;
}

.mode-buttons {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.mode-btn {
    border: 1px solid var(--border);
    background: linear-gradient(#ffffff, #f8fafc);
    padding: 10px 18px;
    border-radius: 999px;
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
    color: var(--text-muted);
    transition: 0.25s;
}

.mode-btn:hover {
    border-color: var(--border-strong);
    color: var(--text);
}

.mode-btn.active {
    background: var(--gradient);
    color: #fff;
    border-color: transparent;
    box-shadow: var(--shadow-sm);
}

.layout-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 24px;
}

.span-2 {
    grid-column: span 2;
}

@media (max-width: 900px) {
    .span-2 {
        grid-column: span 1;
    }
}

.card {
    background: var(--bg-alt);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 20px 22px;
    box-shadow: var(--shadow-sm);
    position: relative;
    overflow: hidden;
}

.card.subtle {
    background: #ffffffaa;
    backdrop-filter: blur(6px);
}

.section-title {
    margin: 0 0 14px;
    font-size: 1rem;
    font-weight: 600;
    letter-spacing: .5px;
    text-transform: uppercase;
    color: var(--text-muted);
}

.chip-group {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.chip {
    border: 1px solid var(--border);
    background: #fff;
    padding: 10px 16px;
    border-radius: 999px;
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: .25s;
    color: var(--text-muted);
}

.chip:hover {
    border-color: var(--border-strong);
    color: var(--text);
}

.chip.active {
    background: var(--gradient);
    color: #fff;
    border-color: transparent;
    box-shadow: var(--shadow-sm);
}

.main-work {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.problem-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    flex-wrap: wrap;
}

.problem-display {
    display: flex;
    justify-content: center;
}

.problem-box {
    background: #ffffff;
    border: 1px solid var(--border);
    min-height: 100px;
    padding: 28px 30px;
    width: 100%;
    border-radius: var(--radius);
    font-size: clamp(1.8rem, 4vw, 2.6rem);
    font-weight: 600;
    text-align: center;
    display: flex;
    align-items: center;
    justify-content: center;
    letter-spacing: 1px;
    position: relative;
}

.problem-box.muted {
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--text-muted);
    letter-spacing: 0;
}

.answer-row {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    justify-content: center;
}

#answer-input {
    padding: 14px 18px;
    font-size: 1.2rem;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    width: 180px;
    text-align: center;
    background: #fff;
    font-weight: 600;
    color: var(--text);
    transition: .25s;
}

#answer-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99,102,241,0.25);
}

.btn {
    --btn-bg: var(--bg-alt);
    --btn-color: var(--text);
    --btn-border: var(--border);
    padding: 12px 20px;
    border-radius: 10px;
    border: 1px solid var(--btn-border);
    background: var(--btn-bg);
    color: var(--btn-color);
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
    line-height: 1;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    transition: .25s;
    letter-spacing: .5px;
}

.btn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.btn:active:not(:disabled) {
    transform: translateY(0);
}

.btn:disabled {
    opacity: .55;
    cursor: not-allowed;
}

.btn.primary {
    --btn-bg: var(--gradient);
    --btn-color: #fff;
    --btn-border: transparent;
}

.btn.success {
    --btn-bg: linear-gradient(135deg, #16a34a, #15803d);
    --btn-color: #fff;
    --btn-border: transparent;
}

.btn.danger {
    --btn-bg: linear-gradient(135deg, #ef4444, #dc2626);
    --btn-color: #fff;
    --btn-border: transparent;
}

.btn.ghost {
    --btn-bg: #fff;
    --btn-color: var(--text-muted);
    --btn-border: var(--border);
}

.btn.ghost:hover {
    --btn-color: var(--text);
}

.btn.small {
    padding: 9px 16px;
    font-size: 0.75rem;
    border-radius: 8px;
    letter-spacing: 1px;
}

.options-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(110px, 1fr));
    gap: 14px;
    margin-top: 4px;
}

.option-btn {
    background: #fff;
    border: 1px solid var(--border);
    padding: 16px 10px;
    border-radius: var(--radius);
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: .25s;
    position: relative;
    color: var(--text);
}

.option-btn:hover:not(:disabled) {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99,102,241,0.15);
    transform: translateY(-2px);
}

.option-btn.correct {
    background: #ecfdf5;
    border-color: #34d399;
    color: #065f46;
    box-shadow: 0 0 0 3px rgba(16,185,129,0.25);
}

.option-btn.incorrect {
    background: #fef2f2;
    border-color: #f87171;
    color: #7f1d1d;
    opacity: .9;
}

.feedback {
    padding: 16px 18px;
    border-radius: var(--radius);
    font-weight: 600;
    font-size: 0.95rem;
    border: 1px solid;
    animation: fadeIn .35s ease;
}

.feedback.correct {
    background: #ecfdf5;
    border-color: #34d399;
    color: #065f46;
}

.feedback.incorrect {
    background: #fef2f2;
    border-color: #f87171;
    color: #7f1d1d;
}

.solution {
    margin-top: -4px;
    background: #eef2ff;
    border: 1px solid #c7d2fe;
    padding: 16px 18px;
    border-radius: var(--radius);
    animation: fadeIn .4s ease;
}

.solution h4 {
    margin: 0 0 8px;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: .5px;
    color: var(--primary);
}

.stats {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.stats-grid {
    display: grid;
    gap: 14px;
    grid-template-columns: repeat(auto-fit, minmax(110px, 1fr));
}

.stat {
    background: linear-gradient(#ffffff, #f8fafc);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 14px 12px 12px;
    text-align: center;
    position: relative;
}

.stat-label {
    font-size: 0.65rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: 600;
    color: var(--text-muted);
    display: block;
    margin-bottom: 4px;
}

.stat-value {
    font-size: 1.4rem;
    font-weight: 700;
    letter-spacing: -1px;
    color: var(--text);
}

.app-footer {
    text-align: center;
    font-size: 0.7rem;
    color: var(--text-muted);
    padding: 6px 0 20px;
    letter-spacing: .5px;
}

.hidden { display: none !important; }

/* Animationer */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(4px); }
    to { opacity: 1; transform: translateY(0); }
}

.pulse {
    animation: pulseScale .5s ease;
}

@keyframes pulseScale {
    0% { transform: scale(1); }
    40% { transform: scale(1.06); }
    100% { transform: scale(1); }
}

/* Scrollbar (desktop) */
@media (hover: hover) {
    * {
        scrollbar-width: thin;
        scrollbar-color: var(--primary) transparent;
    }
    *::-webkit-scrollbar {
        width: 10px;
        height: 10px;
    }
    *::-webkit-scrollbar-track {
        background: transparent;
    }
    *::-webkit-scrollbar-thumb {
        background: linear-gradient(var(--primary), var(--primary-accent));
        border-radius: 20px;
        border: 2px solid #fff;
    }
}

@media (max-width: 700px) {
    body {
        padding: 16px;
    }
    .app-shell {
        gap: 18px;
    }
    .problem-box {
        min-height: 80px;
        padding: 18px 16px;
    }
    .options-grid {
        grid-template-columns: repeat(auto-fit, minmax(90px, 1fr));
        gap: 10px;
    }
    #answer-input {
        width: 160px;
    }
}

/* Achievements redesigned */
#achievements-section {
    position: static;
    width: 100%;
    background: linear-gradient(135deg, #fff8e1 0%, #fff 70%);
    border: 1px solid #f3d276;
}

.achievements-list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.achievement-item {
    background: #fff;
    border: 1px solid #f0e2b6;
    border-radius: 12px;
    padding: 12px 14px 10px;
    position: relative;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    display: grid;
    grid-template-columns: auto 1fr auto;
    gap: 12px;
    align-items: center;
}

.achievement-icon {
    font-size: 1.6rem;
    filter: drop-shadow(0 1px 2px rgba(0,0,0,0.15));
}

.achievement-content {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.achievement-title {
    font-size: 0.9rem;
    font-weight: 600;
    color: #7a5b00;
    margin: 0;
}

.achievement-desc {
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: .5px;
    color: #b08500;
    margin: 0;
}

.achievement-progress-wrapper {
    grid-column: 1 / -1;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.progress-bar {
    height: 8px;
    background: #f2e3b4;
    border-radius: 4px;
    overflow: hidden;
    position: relative;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg,#ffcc33,#ffb347);
    width: 0%;
    transition: width .4s ease;
}

.achievement-status {
    font-size: 0.65rem;
    font-weight: 600;
    letter-spacing: .5px;
    color: #a07a00;
    text-align: right;
}

.achievement-item.locked {
    opacity: .6;
    filter: grayscale(0.3);
}

.achievement-item.unlocked {
    border-color: #ffcc33;
    background: linear-gradient(135deg,#fff5d1,#fffbe9 60%);
    animation: pop 0.6s ease;
}

@keyframes pop { 0% { transform: scale(.96); } 50% { transform: scale(1.01); } 100% { transform: scale(1); } }

#memory-mode {
    margin-top: 20px;
}

#memory-problem {
    font-size: 1.5rem;
    text-align: center;
    margin-bottom: 10px;
}

#memory-answer-input {
    width: 100%;
    padding: 10px;
    font-size: 1rem;
    margin-bottom: 10px;
}

#memory-check-answer {
    width: 100%;
    padding: 10px;
    font-size: 1rem;
}

/* Old achievements styles removed above */

/* Confetti animation */
.confetti-container {
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 0; /* pieces positioned with left + animation */
    pointer-events: none;
    z-index: 9999;
}

.confetti-piece {
    position: absolute;
    top: -10px;
    border-radius: 2px;
    opacity: .9;
    animation: confetti-fall linear forwards;
}

@keyframes confetti-fall {
    0% { transform: translateY(0) rotate(0deg); opacity:1; }
    90% { opacity:1; }
    100% { transform: translateY(110vh) rotate(720deg); opacity:0; }
}

.achievement-item.just-unlocked {
    box-shadow: 0 0 0 2px #ffcc33, 0 0 12px 2px rgba(255,204,51,0.6);
}

/* New Modes Styling */
.speed-header { display:flex; justify-content: space-between; align-items:center; margin-bottom:12px; }
.speed-timer { font-weight:700; font-size:1.1rem; color:#ff6b00; }
.speed-score { font-size:0.85rem; color:var(--text-muted); }
.speed-progress { height:6px; background:#eee; border-radius:4px; overflow:hidden; margin-top:10px; }
#speed-progress-bar { height:100%; width:0%; background:linear-gradient(90deg,#ff9800,#ffcc33); transition:width .25s; }

#word-problem.small-text { font-size:0.9rem; line-height:1.3; }
.hint { margin-top:8px; background:#fff9d6; border:1px solid #f3d276; padding:8px 10px; border-radius:8px; font-size:0.8rem; }

#numberline-options .option-btn { font-size:0.9rem; }

#pattern-sequence { font-family:monospace; letter-spacing:2px; }

#geometry-problem { font-size:1rem; }