:root {
    /* Color Palette - Light Mode (Healing Theme) */
    --background-color: #FAF9F6; /* Off-White/Linen - 像亚麻纸一样的质感 */
    --card-color: #FFFFFF;
    --text-color: #2C3E50; /* Deep Slate - 柔和的深灰 */
    --text-muted-color: #64748B; /* Blue Grey */
    --header-color: #1a1a2e;
    --accent-color: #8E44AD; /* Wisteria Purple - 灵性紫 */
    --accent-color-rgb: 142, 68, 173;
    --accent-hover-color: #732d91;
    --secondary-accent-color: #F1C40F; /* Muted Gold */
    --secondary-accent-color-rgb: 241, 196, 15;
    --nav-border-color: rgba(0, 0, 0, 0.03);
    
    /* Shape & Texture */
    --border-radius-lg: 24px; /* 大圆角 */
    --border-radius-pill: 50px;
    --shadow-soft: 0 10px 40px -10px rgba(0, 0, 0, 0.08); /* 柔和悬浮阴影 */
    
    /* Typography - System Stack */
    --font-main: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    /* 标题使用 Zen Maru Gothic 增加圆润感 */
    --font-header: "Zen Maru Gothic", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

/* Traditional Chinese overrides */
:root:lang(zh-Hant), :root:lang(zh-Hant-HK), :root:lang(zh-HK), :root:lang(zh-TW) {
    --font-main: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang TC", "Hiragino Sans CNS", "Microsoft JhengHei", sans-serif;
}

/* Japanese overrides */
:root:lang(ja), :root:lang(ja-JP) {
    --font-main: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Hiragino Kaku Gothic ProN", "Hiragino Sans", "Meiryo", sans-serif;
}

[data-bs-theme="dark"] {
    /* Color Palette - Dark Mode (Midnight Sky) */
    --background-color: #0B1021; /* Deep Midnight - 深空蓝黑 */
    --card-color: #151B2E; /* Lighter Midnight - 增加层次 */
    --text-color: #E2E8F0; /* Soft White */
    --text-muted-color: #94A3B8;
    --header-color: #F8FAFC;
    --accent-color: #A29BFE; /* Soft Lavender - 夜晚发光的淡紫 */
    --accent-color-rgb: 162, 155, 254;
    --accent-hover-color: #8e84e6;
    --secondary-accent-color: #FFD700; /* Gold */
    --secondary-accent-color-rgb: 255, 215, 0;
    --nav-border-color: rgba(255, 255, 255, 0.05);
    --shadow-soft: 0 10px 40px -10px rgba(0, 0, 0, 0.4);
}

body {
    background-color: var(--background-color);
    color: var(--text-color);
    font-family: var(--font-main);
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    transition: background-color 0.4s ease, color 0.4s ease;
    line-height: 1.8; /* 增加行高至 1.8，呼吸感更强 */
    letter-spacing: -0.01em; /* 正文微调紧凑，增加高级感 */
}

p {
    margin-bottom: 1.5rem; /* 增加段落间距 */
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-header);
    color: var(--header-color);
    font-weight: 700;
    letter-spacing: 0.05em; /* 标题增加字间距，更有张力 */
}

/* Navbar Customization */
.navbar {
    background-color: var(--card-color) !important;
    border-bottom: 1px solid var(--nav-border-color);
    transition: background-color 0.3s, border-bottom-color 0.3s;
    padding-top: 0.8rem;
    padding-bottom: 0.8rem;
    box-shadow: 0 2px 15px rgba(0,0,0,0.02);
}

[data-bs-theme="dark"] .navbar-toggler-icon {
    filter: invert(1) grayscale(100%) brightness(200%);
}

.navbar-brand {
    font-family: 'ZCOOL KuaiLe', cursive;
    font-size: 1.6rem;
    color: var(--accent-color) !important; /* 品牌色 */
}

.nav-link {
    color: var(--header-color) !important;
    font-weight: 500;
    transition: color 0.2s ease;
}

.nav-link:hover {
    color: var(--accent-color) !important;
}

/* Footer Customization */
#footer {
    background-color: var(--card-color);
    color: var(--text-muted-color);
    padding: 20px 0;
    margin-top: auto;
    border-top: 1px solid var(--nav-border-color);
    text-align: center;
    transition: background-color 0.3s, border-top-color 0.3s;
}

#main_container {
    flex: 1;
    padding-bottom: 60px;
}

/* Card Customization */
.card {
    background-color: var(--card-color);
    color: var(--text-color);
    border: 1px solid var(--nav-border-color);
    transition: transform 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275), box-shadow 0.3s ease, border-color 0.3s;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-soft);
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 35px rgba(var(--accent-color-rgb), 0.15), 0 5px 15px rgba(0,0,0,0.05); /* Glow effect */
    border-color: rgba(var(--accent-color-rgb), 0.3);
}

[data-bs-theme="dark"] .card:hover {
    box-shadow: 0 0 25px rgba(var(--accent-color-rgb), 0.25), 0 0 1px rgba(255, 255, 255, 0.1); /* 增强深色模式自发光感 */
}

/* Feature Icon Wrapper */
.feature-icon-wrapper {
    width: 72px;
    height: 72px;
    background-color: rgba(142, 68, 173, 0.08); /* Accent tint */
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem auto;
    color: var(--accent-color);
    transition: all 0.4s ease;
}
[data-bs-theme="dark"] .feature-icon-wrapper {
    background-color: rgba(162, 155, 254, 0.1);
}
.card:hover .feature-icon-wrapper {
    background-color: var(--accent-color);
    color: #fff;
    transform: rotate(10deg) scale(1.1);
}
.feature-icon-wrapper svg {
    width: 36px;
    height: 36px;
    stroke-width: 1.5;
}

/* Buttons */
.btn {
    border-radius: var(--border-radius-pill);
    padding: 0.6rem 1.8rem;
    font-weight: 600;
    transition: all 0.3s ease;
}

.btn-primary {
    background-color: var(--accent-color);
    border-color: var(--accent-color);
}

.btn-primary:hover, .btn-primary:focus, .btn-primary:active {
    background-color: var(--accent-hover-color);
    border-color: var(--accent-hover-color);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(142, 68, 173, 0.3);
}

.btn-outline-primary {
    color: var(--accent-color);
    border-color: var(--accent-color);
}
.btn-outline-primary:hover, .btn-outline-primary:focus, .btn-outline-primary:active {
    background-color: var(--accent-color);
    border-color: var(--accent-color);
    color: #fff;
}

.btn-outline-secondary {
    color: var(--text-color);
    border-color: var(--nav-border-color);
}
.btn-outline-secondary:hover {
    background-color: var(--card-color);
    color: var(--accent-color);
    border-color: var(--accent-color);
}

/* Custom Login Button */
.btn-custom-login {
    color: var(--text-color);
    border: 1px solid var(--text-color);
    background-color: transparent;
    transition: all 0.3s ease;
    border-radius: 20px;
    padding: 0.375rem 1.2rem;
}

.btn-custom-login:hover {
    background-color: var(--text-color);
    color: var(--background-color);
}

[data-bs-theme="dark"] .btn-custom-login:hover {
    background-color: #E0E0E0;
    color: #121212;
}

/* Mood Selector */
.mood-selector-container {
    background-color: var(--card-color);
    border: 1px solid var(--nav-border-color);
    box-shadow: var(--shadow-soft);
}

/* Override text-muted for dark mode visibility */
.text-muted {
    color: var(--text-muted-color) !important;
}

/* Chart Container */
.chart-container {
    max-width: 800px;
    margin: 0 auto;
}

/* Ensure SVG scales responsively */
.chart-container svg {
    width: 100%;
    height: auto;
}

/* Dark mode tweaks for SVGs */
[data-bs-theme="dark"] img[src*=".svg"] {
    filter: invert(1) hue-rotate(180deg);
}

/* Ensure the chart (likely dark lines) is visible in dark mode by keeping its background light */
[data-bs-theme="dark"] .chart-container {
    background-color: #ffffff;
    padding: 15px;
    border-radius: 8px;
}

/* Flatpickr Dark Mode Overrides */
[data-bs-theme="dark"] .flatpickr-calendar {
    background: var(--card-color);
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    border: 1px solid var(--nav-border-color);
}
[data-bs-theme="dark"] .flatpickr-calendar.hasTime .flatpickr-time {
    border-top: 1px solid var(--nav-border-color);
}
[data-bs-theme="dark"] .flatpickr-calendar.arrowTop:before, 
[data-bs-theme="dark"] .flatpickr-calendar.arrowTop:after {
    border-bottom-color: var(--card-color);
}
[data-bs-theme="dark"] .flatpickr-calendar.arrowBottom:before, 
[data-bs-theme="dark"] .flatpickr-calendar.arrowBottom:after {
    border-top-color: var(--card-color);
}
[data-bs-theme="dark"] .flatpickr-months .flatpickr-month {
    background: var(--card-color);
    color: var(--text-color);
    fill: var(--text-color);
}
[data-bs-theme="dark"] .flatpickr-months .flatpickr-prev-month, 
[data-bs-theme="dark"] .flatpickr-months .flatpickr-next-month {
    fill: var(--text-color);
}
[data-bs-theme="dark"] .flatpickr-months .flatpickr-prev-month:hover svg, 
[data-bs-theme="dark"] .flatpickr-months .flatpickr-next-month:hover svg {
    fill: var(--accent-color);
}
[data-bs-theme="dark"] .flatpickr-weekdays {
    background: var(--card-color);
}
[data-bs-theme="dark"] span.flatpickr-weekday {
    background: var(--card-color);
    color: var(--text-muted-color);
}
[data-bs-theme="dark"] .flatpickr-day {
    color: var(--text-color);
}
[data-bs-theme="dark"] .flatpickr-day.flatpickr-disabled, 
[data-bs-theme="dark"] .flatpickr-day.flatpickr-disabled:hover {
    color: var(--text-muted-color);
}
[data-bs-theme="dark"] .flatpickr-day.today {
    border-color: var(--accent-color);
}
[data-bs-theme="dark"] .flatpickr-day.today:hover,
[data-bs-theme="dark"] .flatpickr-day.today:focus {
    border-color: var(--accent-color);
    background: var(--accent-color);
    color: #fff;
}
[data-bs-theme="dark"] .flatpickr-day.selected, 
[data-bs-theme="dark"] .flatpickr-day.startRange, 
[data-bs-theme="dark"] .flatpickr-day.endRange, 
[data-bs-theme="dark"] .flatpickr-day.selected.inRange, 
[data-bs-theme="dark"] .flatpickr-day.startRange.inRange, 
[data-bs-theme="dark"] .flatpickr-day.endRange.inRange, 
[data-bs-theme="dark"] .flatpickr-day.selected:focus, 
[data-bs-theme="dark"] .flatpickr-day.startRange:focus, 
[data-bs-theme="dark"] .flatpickr-day.endRange:focus, 
[data-bs-theme="dark"] .flatpickr-day.selected:hover, 
[data-bs-theme="dark"] .flatpickr-day.startRange:hover, 
[data-bs-theme="dark"] .flatpickr-day.endRange:hover, 
[data-bs-theme="dark"] .flatpickr-day.selected.prevMonthDay, 
[data-bs-theme="dark"] .flatpickr-day.startRange.prevMonthDay, 
[data-bs-theme="dark"] .flatpickr-day.endRange.prevMonthDay, 
[data-bs-theme="dark"] .flatpickr-day.selected.nextMonthDay, 
[data-bs-theme="dark"] .flatpickr-day.startRange.nextMonthDay, 
[data-bs-theme="dark"] .flatpickr-day.endRange.nextMonthDay {
    background: var(--accent-color);
    border-color: var(--accent-color);
    color: #fff;
}
[data-bs-theme="dark"] .flatpickr-time .flatpickr-time-separator, 
[data-bs-theme="dark"] .flatpickr-time .numInputWrapper span.arrowUp:after, 
[data-bs-theme="dark"] .flatpickr-time .numInputWrapper span.arrowDown:after {
    color: var(--text-color);
}
[data-bs-theme="dark"] .flatpickr-time input {
    color: var(--text-color);
}
[data-bs-theme="dark"] .flatpickr-time input:hover, 
[data-bs-theme="dark"] .flatpickr-time .flatpickr-am-pm:hover, 
[data-bs-theme="dark"] .flatpickr-time input:focus, 
[data-bs-theme="dark"] .flatpickr-time .flatpickr-am-pm:focus {
    background: #334155;
}

/* Custom Accent Helpers */
.text-accent { color: var(--accent-color) !important; }
.border-accent { border-color: var(--accent-color) !important; }

/* --- Common Utilities & Animations (Extracted from about.css & index.css) --- */

/* Spacing */
.py-6 {
    padding-top: 5rem;
    padding-bottom: 5rem;
}

/* Typography Effects */
.text-gradient {
    background: linear-gradient(135deg, var(--accent-color) 0%, #6366f1 100%); /* 灵性紫到靛蓝的优雅过渡 */
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: inline-block; /* 确保背景裁剪生效 */
}

[data-bs-theme="dark"] .text-gradient {
    background: linear-gradient(135deg, var(--accent-color) 0%, #c084fc 100%); /* 深色模式下使用更亮的紫色过渡 */
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Common Hero Section Base */
.hero-section-common {
    min-height: 50vh;
    padding-top: 4rem;
    padding-bottom: 4rem;
    background: radial-gradient(circle at 50% 50%, rgba(var(--accent-color-rgb), 0.05) 0%, rgba(255, 255, 255, 0) 70%);
    overflow: hidden;
    position: relative;
}

[data-bs-theme="dark"] .hero-section-common {
    background: radial-gradient(circle at 50% 50%, rgba(var(--accent-color-rgb), 0.15) 0%, rgba(18, 18, 18, 0) 70%);
}

/* Animations */
@keyframes float {
    0% { transform: translateY(0px); }
    50% { transform: translateY(-20px); }
    100% { transform: translateY(0px); }
}

@keyframes breathing-glow {
    0% { box-shadow: 0 0 5px rgba(var(--accent-color-rgb), 0.2); }
    50% { box-shadow: 0 0 20px rgba(var(--accent-color-rgb), 0.6); }
    100% { box-shadow: 0 0 5px rgba(var(--accent-color-rgb), 0.2); }
}

.floating-animation {
    animation: float 6s ease-in-out infinite;
}

.animate-up {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.animate-up.visible {
    opacity: 1;
    transform: translateY(0);
}

.animate-on-scroll {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.animate-on-scroll.visible {
    opacity: 1;
    transform: translateY(0);
}

.delay-1 { transition-delay: 0.1s; }
.delay-2 { transition-delay: 0.2s; }
.delay-3 { transition-delay: 0.3s; }

/* Responsive adjustments for common sections */
@media (max-width: 768px) {
    .py-6 {
        padding-top: 3rem;
        padding-bottom: 3rem;
    }
}

/* --- User Center Sidebar --- */
.user-sidebar {
    background-color: var(--card-color);
    border: 1px solid var(--nav-border-color);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-soft);
    height: 100%;
    transition: all 0.3s ease;
}

.user-sidebar-nav .nav-link {
    color: var(--text-color);
    font-weight: 500;
    border-radius: 50px; /* Pill shape */
    padding: 0.8rem 1.2rem;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    align-items: center;
    margin-bottom: 0.5rem;
}

.user-sidebar-nav .nav-link i {
    font-size: 1.1em;
    opacity: 0.8;
    transition: transform 0.3s ease;
}

.user-sidebar-nav .nav-link:hover {
    background-color: rgba(var(--accent-color-rgb), 0.08);
    color: var(--accent-color);
    transform: translateX(5px);
}

.user-sidebar-nav .nav-link:hover i {
    transform: scale(1.1);
    opacity: 1;
}

.user-sidebar-nav .nav-link.active {
    background: linear-gradient(135deg, var(--accent-color), var(--accent-hover-color));
    color: #ffffff !important;
    box-shadow: 0 4px 15px rgba(var(--accent-color-rgb), 0.3), 
                inset 0 0 10px rgba(255, 255, 255, 0.1);
    font-weight: 600;
}

[data-bs-theme="dark"] .user-sidebar-nav .nav-link.active,
[data-bs-theme="dark"] .nav-pills .nav-link.active {
    background: linear-gradient(135deg, #6c5ce7, #a29bfe);
    border: 1px solid rgba(var(--secondary-accent-color-rgb), 0.3);
    box-shadow: 0 0 20px rgba(var(--accent-color-rgb), 0.4);
    animation: breathing-glow 3s infinite ease-in-out;
}

.user-sidebar-nav .nav-link.active:hover {
    color: #ffffff !important;
    transform: none;
    box-shadow: 0 6px 20px rgba(var(--accent-color-rgb), 0.5);
    opacity: 0.95;
}

.user-sidebar-nav .nav-link.active i {
    opacity: 1;
}

.user-sidebar-nav .nav-header {
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    color: var(--text-muted-color);
    letter-spacing: 0.05em;
    margin-top: 1.5rem;
    margin-bottom: 0.5rem;
    padding-left: 1rem;
}

.avatar-circle {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, rgba(var(--accent-color-rgb), 0.2), rgba(var(--secondary-accent-color-rgb), 0.2));
    color: var(--accent-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin-right: 1rem;
}

/* --- Global Badge System (Positive/Negative) --- */
.badge-v4 {
    padding: 0.4rem 0.9rem;
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 500;
    display: inline-flex;
    align-items: center;
}

.badge-positive {
    background: rgba(52, 168, 83, 0.08);
    border: none;
    color: #2e7d32; /* Standard green for light mode */
}

.badge-negative {
    background: rgba(234, 67, 53, 0.08);
    border: none;
    color: #c62828; /* Standard red for light mode */
}

[data-bs-theme="dark"] .badge-positive {
    background: rgba(52, 168, 83, 0.2);
    color: #a5d6a7;
}

[data-bs-theme="dark"] .badge-negative {
    background: rgba(234, 67, 53, 0.2);
    color: #ef9a9a;
}

/* --- Cookie Consent Banner --- */
.cookie-banner {
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    background-color: var(--card-color);
    border-top: 1px solid var(--nav-border-color);
    box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.08);
    padding: 1.5rem 0;
    z-index: 1050; /* Above most elements but below modals if needed */
    animation: slideUp 0.5s ease-out;
}

[data-bs-theme="dark"] .cookie-banner {
    box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.3);
}

@keyframes slideUp {
    from { transform: translateY(100%); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

/* --- Chart Hero Component (Celestial Glassmorphism) --- */
.chart-hero-glass {
    position: relative;
    overflow: hidden;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.6) 0%, rgba(240, 240, 255, 0.4) 100%);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.5);
    box-shadow: 0 10px 40px -10px rgba(0, 0, 0, 0.05);
    border-radius: 24px;
    transition: all 0.4s ease;
}

[data-bs-theme="dark"] .chart-hero-glass {
    background: linear-gradient(135deg, rgba(21, 27, 46, 0.7) 0%, rgba(30, 30, 50, 0.5) 100%);
    border: 1px solid rgba(255, 255, 255, 0.08);
    box-shadow: 0 10px 40px -10px rgba(0, 0, 0, 0.4);
}

/* Ambient Glow Blobs */
.hero-glow-blob {
    position: absolute;
    width: 300px;
    height: 300px;
    border-radius: 50%;
    filter: blur(60px);
    opacity: 0.4;
    z-index: 0;
    pointer-events: none;
    animation: float-slow 10s infinite alternate;
}

.hero-glow-blob.blob-1 {
    top: -100px;
    right: -50px;
    background: radial-gradient(circle, var(--accent-color) 0%, transparent 70%);
    animation-delay: 0s;
}

.hero-glow-blob.blob-2 {
    bottom: -100px;
    left: -50px;
    background: radial-gradient(circle, var(--secondary-accent-color) 0%, transparent 70%);
    animation-delay: -5s;
}

@keyframes float-slow {
    0% { transform: translate(0, 0) scale(1); }
    100% { transform: translate(20px, -20px) scale(1.1); }
}

/* Glass Navigation */
.nav-pills-glass {
    display: inline-flex;
    background: rgba(255, 255, 255, 0.5);
    backdrop-filter: blur(5px);
    border: 1px solid rgba(255, 255, 255, 0.6);
    border-radius: 50px;
    padding: 6px;
    box-shadow: inset 0 2px 5px rgba(0,0,0,0.02);
}

[data-bs-theme="dark"] .nav-pills-glass {
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.05);
    box-shadow: inset 0 2px 5px rgba(0,0,0,0.2);
}

.nav-link-glass {
    border-radius: 50px;
    padding: 0.7rem 2rem;
    font-weight: 600;
    color: var(--text-muted-color);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border: 1px solid transparent;
}

.nav-link-glass:hover:not(.active):not(:disabled) {
    color: var(--accent-color);
    background: rgba(var(--accent-color-rgb), 0.05);
}

.nav-link-glass.active {
    background: linear-gradient(135deg, var(--accent-color) 0%, var(--accent-hover-color) 100%);
    color: white !important;
    box-shadow: 0 4px 15px rgba(var(--accent-color-rgb), 0.35);
    transform: translateY(-1px);
}

/* Dark Mode specific active state tweak */
[data-bs-theme="dark"] .nav-link-glass.active {
    background: linear-gradient(135deg, #7c6bed 0%, #a29bfe 100%);
    box-shadow: 0 0 20px rgba(162, 155, 254, 0.4);
}

/* Disabled state */
.nav-link-glass:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}