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

:root {
    /* Default inputs (Black & White) */
    --theme-bg: #F8F9FA;
    --theme-card-bg: #FFFFFF;
    --theme-text-main: #1A1A1A;
    --theme-text-sub: #71717A;
    --theme-primary: #1A1A1A;
    --theme-primary-fg: #FFFFFF;
    --theme-border: #E5E7EB;
    --theme-accent-subtle: #F1F5F9;
}



body {
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang TC", "Noto Sans TC", "Microsoft JhengHei", "Inter", sans-serif;
    background-color: var(--theme-bg);
    color: var(--theme-text-main);
    min-height: 100vh;
    overflow-x: hidden;
    padding-top: calc(env(safe-area-inset-top) + 24px) !important;
    padding-bottom: calc(env(safe-area-inset-bottom) + 110px) !important;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* Minimalist Button base */
.premium-btn {
    border-radius: 9999px; /* pill shape */
    transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-weight: 500;
}

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

.premium-btn-primary {
    background: var(--theme-primary);
    color: var(--theme-primary-fg);
    border: 1px solid transparent;
}

.premium-btn-secondary {
    background: var(--theme-card-bg);
    color: var(--theme-text-main);
    border: 1px solid var(--theme-border);
}

.premium-btn-secondary:hover {
    background: var(--theme-accent-subtle);
}

/* Form inputs */
.premium-input {
    border: 1px solid var(--theme-border);
    border-radius: 12px;
    background: var(--theme-card-bg);
    color: var(--theme-text-main);
    padding: 0.75rem 1rem;
    width: 100%;
    transition: border-color 0.2s ease, box-shadow 0.2s ease, background-color 0.3s ease;
    outline: none;
}
.premium-input:focus {
    border-color: var(--theme-primary);
    box-shadow: 0 0 0 2px var(--theme-accent-subtle);
}

/* Cards */
.premium-card {
    background: var(--theme-card-bg);
    border: 1px solid var(--theme-border);
    border-radius: 20px;
    box-shadow: 0 2px 8px -2px rgba(0,0,0,0.02);
    transition: transform 0.2s ease, box-shadow 0.2s ease, background-color 0.3s ease, border-color 0.3s ease;
}

/* Card Entrance Animation */
@keyframes slideUpFade {
    0% { transform: translateY(20px); opacity: 0; }
    100% { transform: translateY(0); opacity: 1; }
}
.card-anim {
    animation: slideUpFade 0.6s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.delay-1 { animation-delay: 0.1s; opacity: 0; }
.delay-2 { animation-delay: 0.15s; opacity: 0; }
.delay-3 { animation-delay: 0.2s; opacity: 0; }

/* Custom Checkbox (Toggle feel) */
.custom-checkbox {
    appearance: none;
    width: 44px;
    height: 24px;
    border-radius: 9999px;
    background-color: var(--theme-border);
    cursor: pointer;
    position: relative;
    display: inline-block;
    vertical-align: middle;
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.custom-checkbox::before {
    content: '';
    position: absolute;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: white;
    top: 2px;
    left: 2px;
    transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.custom-checkbox:checked {
    background-color: var(--theme-primary);
}

.custom-checkbox:checked::before {
    transform: translateX(20px);
}

/* Streak Animation */
@keyframes streakPop {
    0% { transform: scale(1); }
    50% { transform: scale(1.1); color: var(--theme-primary); }
    100% { transform: scale(1); }
}
.streak-anim {
    animation: streakPop 0.5s cubic-bezier(0.16, 1, 0.3, 1);
    display: inline-block;
}

/* Modal and Swipe Mechanics */
.hidden { display: none !important; }

.modal-swipe {
    will-change: transform;
    backface-visibility: hidden;
    touch-action: pan-y;
    transition: transform 0.4s cubic-bezier(0.32, 0.72, 0, 1);
    background: rgba(250, 250, 250, 0.75) !important;
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
}

[data-theme="dark"] .modal-swipe {
    background: rgba(9, 9, 11, 0.75) !important;
}

/* Splash Screen Animation Classes */
.splash-fade-content {
    transition: opacity 0.4s cubic-bezier(0.16, 1, 0.3, 1), transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

/* iPhone Safe Area Adaptation for Full-screen Modals */
.modal-swipe > header {
    padding-top: calc(env(safe-area-inset-top) + 1rem) !important;
}

.modal-swipe {
    padding-bottom: calc(env(safe-area-inset-bottom) + 5rem) !important;
}

.bottom-action-bar {
    padding-bottom: calc(env(safe-area-inset-bottom) + 16px) !important;
}