/* ============================================
   🍺 ワリカンくん - Design System & Styles
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&family=Noto+Sans+JP:wght@400;500;600;700;800&display=swap');

/* --- CSS Variables --- */
:root {
    /* Colors */
    --bg-primary: #0a0e1a;
    --bg-secondary: #111827;
    --bg-card: rgba(255, 255, 255, 0.04);
    --bg-card-hover: rgba(255, 255, 255, 0.07);
    --bg-glass: rgba(255, 255, 255, 0.06);
    --border-glass: rgba(255, 255, 255, 0.1);
    --border-active: rgba(251, 191, 36, 0.4);

    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --text-accent: #fbbf24;

    --accent-primary: #f59e0b;
    --accent-secondary: #d97706;
    --accent-gradient: linear-gradient(135deg, #f59e0b 0%, #f97316 50%, #ef4444 100%);
    --accent-glow: rgba(245, 158, 11, 0.3);

    --success: #22c55e;
    --danger: #ef4444;
    --info: #3b82f6;

    /* Spacing */
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 16px;
    --space-lg: 24px;
    --space-xl: 32px;
    --space-2xl: 48px;

    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.4);
    --shadow-glow: 0 0 20px var(--accent-glow);

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.25s ease;
    --transition-slow: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

/* --- Reset & Base --- */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: 'Noto Sans JP', 'Inter', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
    line-height: 1.6;
}

/* Animated background */
body::before {
    content: '';
    position: fixed;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(ellipse at 20% 50%, rgba(245, 158, 11, 0.08) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 20%, rgba(249, 115, 22, 0.06) 0%, transparent 50%),
        radial-gradient(ellipse at 50% 80%, rgba(139, 92, 246, 0.05) 0%, transparent 50%);
    animation: bgFloat 20s ease-in-out infinite;
    z-index: -1;
}

@keyframes bgFloat {

    0%,
    100% {
        transform: translate(0, 0) rotate(0deg);
    }

    33% {
        transform: translate(-2%, 1%) rotate(1deg);
    }

    66% {
        transform: translate(1%, -2%) rotate(-1deg);
    }
}

/* --- App Container --- */
.app-container {
    max-width: 480px;
    margin: 0 auto;
    padding: var(--space-md);
    padding-bottom: 100px;
}

/* --- Header --- */
.header {
    text-align: center;
    padding: var(--space-xl) 0 var(--space-lg);
}

.header-icon {
    font-size: 3rem;
    display: block;
    margin-bottom: var(--space-sm);
    animation: beerBounce 2s ease-in-out infinite;
}

@keyframes beerBounce {

    0%,
    100% {
        transform: translateY(0) rotate(0deg);
    }

    25% {
        transform: translateY(-6px) rotate(-3deg);
    }

    75% {
        transform: translateY(-3px) rotate(2deg);
    }
}

.header-title {
    font-size: 1.75rem;
    font-weight: 800;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.02em;
}

.header-subtitle {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: var(--space-xs);
}

/* --- Card --- */
.card {
    background: var(--bg-glass);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    margin-bottom: var(--space-md);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    transition: border-color var(--transition-normal);
}

.card:hover {
    border-color: rgba(255, 255, 255, 0.15);
}

.card-label {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: var(--space-md);
}

.card-label-icon {
    font-size: 1rem;
}

/* --- Amount Input --- */
.amount-display {
    background: var(--bg-secondary);
    border: 2px solid var(--border-glass);
    border-radius: var(--radius-md);
    padding: var(--space-md) var(--space-lg);
    text-align: right;
    font-size: 2rem;
    font-weight: 700;
    font-family: 'Inter', monospace;
    color: var(--text-primary);
    letter-spacing: 0.02em;
    transition: border-color var(--transition-fast);
    position: relative;
    overflow: hidden;
}

.amount-display:focus-within {
    border-color: var(--accent-primary);
    box-shadow: var(--shadow-glow);
}

.amount-prefix {
    color: var(--text-muted);
    font-size: 1.4rem;
    margin-right: var(--space-xs);
}

.amount-value {
    color: var(--text-primary);
}

.amount-cursor {
    display: inline-block;
    width: 2px;
    height: 2rem;
    background: var(--accent-primary);
    vertical-align: middle;
    margin-left: 2px;
    animation: blink 1s step-end infinite;
}

@keyframes blink {
    50% {
        opacity: 0;
    }
}

/* Numpad */
.numpad {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-sm);
    margin-top: var(--space-md);
}

.numpad-btn {
    background: var(--bg-card);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 1.25rem;
    font-weight: 600;
    font-family: 'Inter', sans-serif;
    padding: var(--space-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    user-select: none;
    -webkit-tap-highlight-color: transparent;
}

.numpad-btn:hover {
    background: var(--bg-card-hover);
    border-color: rgba(255, 255, 255, 0.2);
    transform: scale(1.03);
}

.numpad-btn:active {
    transform: scale(0.97);
    background: rgba(255, 255, 255, 0.1);
}

.numpad-btn.numpad-clear {
    color: var(--danger);
}

.numpad-btn.numpad-backspace {
    color: var(--text-secondary);
}

.numpad-btn.numpad-quick {
    font-size: 0.85rem;
    color: var(--text-accent);
    background: rgba(245, 158, 11, 0.08);
    border-color: rgba(245, 158, 11, 0.2);
}

.numpad-btn.numpad-quick:hover {
    background: rgba(245, 158, 11, 0.15);
}

/* --- People Counter --- */
.counter-row {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-lg);
}

.counter-btn {
    width: 52px;
    height: 52px;
    border-radius: 50%;
    border: 2px solid var(--border-glass);
    background: var(--bg-card);
    color: var(--text-primary);
    font-size: 1.5rem;
    font-weight: 700;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
    user-select: none;
    -webkit-tap-highlight-color: transparent;
}

.counter-btn:hover {
    background: var(--bg-card-hover);
    border-color: var(--accent-primary);
    box-shadow: var(--shadow-glow);
    transform: scale(1.1);
}

.counter-btn:active {
    transform: scale(0.95);
}

.counter-btn:disabled {
    opacity: 0.3;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.counter-value {
    font-size: 2.5rem;
    font-weight: 800;
    font-family: 'Inter', sans-serif;
    min-width: 80px;
    text-align: center;
}

.counter-unit {
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-left: var(--space-xs);
}

/* --- Options Section --- */
.options-section {
    margin-bottom: var(--space-md);
}

.options-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-md) var(--space-lg);
    background: var(--bg-glass);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-lg);
    cursor: pointer;
    user-select: none;
    transition: all var(--transition-normal);
}

.options-header:hover {
    border-color: rgba(255, 255, 255, 0.2);
}

.options-header-text {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.options-chevron {
    font-size: 0.8rem;
    color: var(--text-muted);
    transition: transform var(--transition-normal);
}

.options-header.is-open .options-chevron {
    transform: rotate(180deg);
}

.options-body {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-slow);
}

.options-body.is-open {
    max-height: 1200px;
}

.options-body-inner {
    padding-top: var(--space-sm);
}

/* Option Item */
.option-item {
    background: var(--bg-glass);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-md);
    padding: var(--space-md) var(--space-lg);
    margin-bottom: var(--space-sm);
    transition: border-color var(--transition-normal);
}

.option-item.is-active {
    border-color: var(--border-active);
    background: rgba(245, 158, 11, 0.04);
}

.option-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.option-label {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: 0.9rem;
    font-weight: 500;
}

.option-label-icon {
    font-size: 1.1rem;
}

.option-desc {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: var(--space-xs);
}

/* Toggle Switch */
.toggle {
    position: relative;
    width: 48px;
    height: 26px;
    cursor: pointer;
}

.toggle input {
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-slider {
    position: absolute;
    inset: 0;
    background: var(--bg-secondary);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-full);
    transition: all var(--transition-normal);
}

.toggle-slider::after {
    content: '';
    position: absolute;
    top: 3px;
    left: 3px;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--text-secondary);
    transition: all var(--transition-normal);
}

.toggle input:checked+.toggle-slider {
    background: var(--accent-primary);
    border-color: var(--accent-secondary);
}

.toggle input:checked+.toggle-slider::after {
    transform: translateX(22px);
    background: white;
}

/* Select */
.select-wrap {
    position: relative;
}

.select-wrap select {
    appearance: none;
    -webkit-appearance: none;
    background: var(--bg-secondary);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.85rem;
    padding: var(--space-sm) var(--space-xl) var(--space-sm) var(--space-md);
    cursor: pointer;
    transition: border-color var(--transition-fast);
    width: 100%;
}

.select-wrap select:focus {
    outline: none;
    border-color: var(--accent-primary);
}

.select-wrap::after {
    content: '▼';
    position: absolute;
    right: var(--space-md);
    top: 50%;
    transform: translateY(-50%);
    font-size: 0.6rem;
    color: var(--text-muted);
    pointer-events: none;
}

/* --- Sub-option Details --- */
.sub-option {
    margin-top: var(--space-md);
    padding-top: var(--space-md);
    border-top: 1px solid var(--border-glass);
    display: none;
}

.sub-option.is-visible {
    display: block;
    animation: fadeSlideIn 0.3s ease;
}

@keyframes fadeSlideIn {
    from {
        opacity: 0;
        transform: translateY(-8px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Mini counter */
.mini-counter {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.mini-counter-btn {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    border: 1px solid var(--border-glass);
    background: var(--bg-card);
    color: var(--text-primary);
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.mini-counter-btn:hover {
    background: var(--bg-card-hover);
    border-color: var(--accent-primary);
}

.mini-counter-btn:active {
    transform: scale(0.9);
}

.mini-counter-value {
    font-size: 1.1rem;
    font-weight: 700;
    font-family: 'Inter', sans-serif;
    min-width: 36px;
    text-align: center;
}

/* Input field */
.input-field {
    background: var(--bg-secondary);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-family: 'Inter', sans-serif;
    font-size: 0.95rem;
    padding: var(--space-sm) var(--space-md);
    width: 100%;
    transition: border-color var(--transition-fast);
}

.input-field:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(245, 158, 11, 0.1);
}

.input-field::placeholder {
    color: var(--text-muted);
}

.input-row {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-sm);
}

.input-row-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
    white-space: nowrap;
    min-width: 80px;
}

/* Tier badges */
.tier-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.tier-row {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.tier-badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 4px 10px;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 600;
    min-width: 72px;
    justify-content: center;
}

.tier-badge.tier-high {
    background: rgba(239, 68, 68, 0.15);
    color: #fca5a5;
    border: 1px solid rgba(239, 68, 68, 0.3);
}

.tier-badge.tier-normal {
    background: rgba(59, 130, 246, 0.15);
    color: #93c5fd;
    border: 1px solid rgba(59, 130, 246, 0.3);
}

.tier-badge.tier-low {
    background: rgba(34, 197, 94, 0.15);
    color: #86efac;
    border: 1px solid rgba(34, 197, 94, 0.3);
}

/* --- Calculate Button --- */
.calc-btn-wrap {
    margin: var(--space-lg) 0;
}

.calc-btn {
    width: 100%;
    padding: var(--space-md) var(--space-lg);
    border: none;
    border-radius: var(--radius-lg);
    background: var(--accent-gradient);
    color: white;
    font-family: inherit;
    font-size: 1.15rem;
    font-weight: 700;
    cursor: pointer;
    position: relative;
    overflow: hidden;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-md), var(--shadow-glow);
}

.calc-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg), 0 0 30px var(--accent-glow);
}

.calc-btn:active {
    transform: translateY(0) scale(0.98);
}

.calc-btn::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(rgba(255, 255, 255, 0.2), transparent);
    pointer-events: none;
}

/* --- Result Section --- */
.result-section {
    display: none;
}

.result-section.is-visible {
    display: block;
    animation: resultAppear 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes resultAppear {
    from {
        opacity: 0;
        transform: translateY(20px) scale(0.95);
    }

    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.result-card {
    background: linear-gradient(135deg, rgba(245, 158, 11, 0.08), rgba(249, 115, 22, 0.04));
    border: 1px solid rgba(245, 158, 11, 0.2);
    border-radius: var(--radius-xl);
    padding: var(--space-xl);
    text-align: center;
}

.result-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-sm);
}

.result-amount {
    font-size: 3rem;
    font-weight: 800;
    font-family: 'Inter', sans-serif;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.2;
}

.result-amount-unit {
    font-size: 1.2rem;
    font-weight: 600;
}

.result-details {
    margin-top: var(--space-lg);
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.result-detail-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-sm) var(--space-md);
    background: rgba(255, 255, 255, 0.03);
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
}

.result-detail-label {
    color: var(--text-secondary);
}

.result-detail-value {
    font-weight: 600;
    font-family: 'Inter', sans-serif;
}

.result-detail-value.highlight {
    color: var(--text-accent);
}

/* Breakdown list */
.result-breakdown {
    margin-top: var(--space-md);
    text-align: left;
}

.result-breakdown-title {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: var(--space-sm);
}

.breakdown-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    transition: background var(--transition-fast);
}

.breakdown-item:nth-child(odd) {
    background: rgba(255, 255, 255, 0.02);
}

.breakdown-item-label {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    color: var(--text-secondary);
}

.breakdown-item-value {
    font-weight: 600;
    font-family: 'Inter', sans-serif;
}

/* --- Action Buttons --- */
.action-btns {
    display: flex;
    gap: var(--space-sm);
    margin-top: var(--space-md);
}

.action-btn {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: var(--space-md);
    background: var(--bg-glass);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-family: inherit;
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.action-btn:hover {
    background: var(--bg-card-hover);
    border-color: rgba(255, 255, 255, 0.2);
    color: var(--text-primary);
}

.action-btn:active {
    transform: scale(0.97);
}

.action-btn.copied {
    background: rgba(34, 197, 94, 0.15);
    border-color: rgba(34, 197, 94, 0.3);
    color: var(--success);
}

/* --- History Section --- */
.history-section {
    margin-top: var(--space-xl);
}

.history-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-md);
}

.history-title {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.history-clear-btn {
    font-size: 0.75rem;
    color: var(--text-muted);
    background: none;
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-full);
    padding: 4px 12px;
    cursor: pointer;
    font-family: inherit;
    transition: all var(--transition-fast);
}

.history-clear-btn:hover {
    color: var(--danger);
    border-color: rgba(239, 68, 68, 0.3);
}

.history-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.history-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-md);
    background: var(--bg-glass);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.history-item:hover {
    background: var(--bg-card-hover);
    border-color: rgba(255, 255, 255, 0.15);
}

.history-item-left {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.history-item-date {
    font-size: 0.7rem;
    color: var(--text-muted);
}

.history-item-desc {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.history-item-amount {
    font-size: 1rem;
    font-weight: 700;
    font-family: 'Inter', sans-serif;
    color: var(--text-accent);
}

.history-empty {
    text-align: center;
    padding: var(--space-xl);
    color: var(--text-muted);
    font-size: 0.85rem;
}

/* Delete button in history */
.history-item-delete {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 0.9rem;
    cursor: pointer;
    padding: 4px 8px;
    border-radius: 4px;
    transition: all var(--transition-fast);
    margin-left: var(--space-sm);
}

.history-item-delete:hover {
    color: var(--danger);
    background: rgba(239, 68, 68, 0.1);
}

.history-item-right {
    display: flex;
    align-items: center;
}

/* --- Toast --- */
.toast {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: var(--bg-secondary);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-full);
    padding: var(--space-sm) var(--space-lg);
    font-size: 0.85rem;
    color: var(--text-primary);
    box-shadow: var(--shadow-lg);
    z-index: 1000;
    opacity: 0;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    pointer-events: none;
}

.toast.is-visible {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}

/* --- Mobile First Enhancements --- */

/* Touch improvements for all mobile */
@media (hover: none) and (pointer: coarse) {

    /* Larger touch targets */
    .numpad-btn {
        padding: var(--space-md) var(--space-sm);
        font-size: 1.3rem;
        min-height: 52px;
    }

    .counter-btn {
        width: 56px;
        height: 56px;
        font-size: 1.6rem;
    }

    .mini-counter-btn {
        width: 38px;
        height: 38px;
        font-size: 1.1rem;
    }

    .calc-btn {
        padding: var(--space-lg);
        font-size: 1.2rem;
        min-height: 56px;
    }

    .action-btn {
        padding: var(--space-md) var(--space-lg);
        min-height: 48px;
    }

    /* Better active states for touch */
    .numpad-btn:active {
        transform: scale(0.93);
        background: rgba(255, 255, 255, 0.12);
        transition-duration: 0.05s;
    }

    .counter-btn:active {
        transform: scale(0.9);
        transition-duration: 0.05s;
    }

    .calc-btn:active {
        transform: translateY(0) scale(0.96);
        transition-duration: 0.05s;
    }

    /* Disable hover effects on touch devices */
    .numpad-btn:hover,
    .counter-btn:hover,
    .mini-counter-btn:hover,
    .options-header:hover {
        transform: none;
    }
}

/* --- Responsive: Standard Mobile --- */
@media (max-width: 480px) {
    .app-container {
        padding: var(--space-sm);
        padding-bottom: env(safe-area-inset-bottom, 24px);
    }

    .header {
        padding: var(--space-lg) 0 var(--space-md);
    }

    .header-icon {
        font-size: 2.5rem;
    }

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

    .header-subtitle {
        font-size: 0.8rem;
    }

    .amount-display {
        font-size: 1.6rem;
        padding: var(--space-md);
    }

    .numpad {
        gap: 6px;
    }

    .numpad-btn {
        padding: var(--space-sm) var(--space-md);
        font-size: 1.15rem;
        border-radius: var(--radius-sm);
    }

    .counter-value {
        font-size: 2.2rem;
    }

    .card {
        padding: var(--space-md);
    }

    .option-item {
        padding: var(--space-sm) var(--space-md);
    }

    .result-amount {
        font-size: 2.5rem;
    }

    .result-card {
        padding: var(--space-lg);
    }
}

/* --- Responsive: Small Mobile (SE, mini) --- */
@media (max-width: 375px) {
    .app-container {
        padding: var(--space-xs);
        padding-bottom: env(safe-area-inset-bottom, 20px);
    }

    .header {
        padding: var(--space-md) 0 var(--space-sm);
    }

    .header-icon {
        font-size: 2rem;
    }

    .header-title {
        font-size: 1.3rem;
    }

    .amount-display {
        font-size: 1.4rem;
        padding: var(--space-sm) var(--space-md);
    }

    .numpad {
        gap: 4px;
    }

    .numpad-btn {
        padding: 8px 6px;
        font-size: 1rem;
    }

    .counter-value {
        font-size: 1.8rem;
    }

    .counter-btn {
        width: 44px;
        height: 44px;
        font-size: 1.3rem;
    }

    .option-label {
        font-size: 0.8rem;
    }

    .result-amount {
        font-size: 2.2rem;
    }

    .action-btns {
        flex-direction: column;
    }
}

/* --- PWA Standalone Mode --- */
@media (display-mode: standalone) {
    body {
        /* Add safe area padding for notched devices */
        padding-top: env(safe-area-inset-top, 0);
        padding-left: env(safe-area-inset-left, 0);
        padding-right: env(safe-area-inset-right, 0);
    }

    .app-container {
        padding-bottom: calc(var(--space-lg) + env(safe-area-inset-bottom, 0));
    }

    .header {
        padding-top: var(--space-md);
    }

    /* Hide browser-specific elements when in standalone */
    .toast {
        bottom: calc(24px + env(safe-area-inset-bottom, 0));
    }
}

/* --- iOS Specific --- */
@supports (-webkit-touch-callout: none) {

    /* Prevent rubber-band scrolling background bleed */
    body {
        overscroll-behavior-y: none;
        -webkit-overflow-scrolling: touch;
    }

    /* Fix input zoom on iOS */
    input[type="number"],
    select {
        font-size: 16px;
    }
}

/* --- Smooth Scrolling --- */
@media (prefers-reduced-motion: no-preference) {
    html {
        scroll-behavior: smooth;
    }
}

@media (prefers-reduced-motion: reduce) {

    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Utility */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}