/* ========================================
   NoteCard Website Styles
   配色取自 App 设计系统 Theme.swift（Treasury Green 国库绿）：
   墨绿背景 + 薄荷钞绿主色 + 价值金（价格/估值专用）+ 纸张米色描边
   ======================================== */

/* CSS Variables */
:root {
    --color-primary: #3DDC97;
    --color-primary-dark: #1FA36C;
    --color-primary-light: #8CF0C4;
    --color-gold: #F2C14E;
    --color-gold-light: #F8DB8F;
    --color-parchment: #EFE6CF;
    --color-bg-dark: #07140F;
    --color-bg-mid: #0C1F18;
    --color-bg-deep: #122B22;
    --color-bg-card: #15302A;
    --color-bg-card-hover: #1B3B33;
    --color-text: #F7F5EE;
    --color-text-secondary: #DCE5DF;
    --color-text-muted: #9DB3A8;
    --color-border: rgba(239, 230, 207, 0.14);
    --color-border-strong: rgba(61, 220, 151, 0.35);
    --color-success: #84CC16;
    --color-info: #60A5FA;

    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --container-width: 1200px;
    --border-radius: 12px;
    --border-radius-lg: 20px;
    --transition: all 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    background-color: var(--color-bg-dark);
    color: var(--color-text);
    line-height: 1.6;
    overflow-x: hidden;
}

a {
    color: inherit;
    text-decoration: none;
    transition: var(--transition);
}

img {
    max-width: 100%;
    height: auto;
}

/* Container */
.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 24px;
}

/* Typography */
h1, h2, h3, h4 {
    font-weight: 700;
    line-height: 1.2;
}

h1 {
    font-size: clamp(2.5rem, 5vw, 4rem);
}

h2 {
    font-size: clamp(2rem, 4vw, 3rem);
}

h3 {
    font-size: 1.5rem;
}

.gradient-text {
    background: linear-gradient(135deg, var(--color-primary-dark), var(--color-primary-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* 金色文字：与 App 一致，只用于价格 / 估值 */
.gold-text {
    background: linear-gradient(135deg, #D9A13A, var(--color-gold-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 24px;
    border-radius: var(--border-radius);
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition);
    border: none;
    text-decoration: none;
}

/* CTA 渐变模拟钞票烫印光泽带（两端深、中间亮） */
.btn-primary {
    background: linear-gradient(90deg, #1FA36C, #5EEBB0, #1FA36C);
    color: #04231A;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(61, 220, 151, 0.25);
}

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

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

.btn-lg {
    padding: 16px 32px;
    font-size: 1.1rem;
}

.btn:disabled,
.btn.is-disabled {
    cursor: default;
    opacity: 0.75;
    pointer-events: none;
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 16px 0;
    background: rgba(7, 20, 15, 0.85);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid transparent;
    transition: var(--transition);
}

.navbar.scrolled {
    border-bottom-color: var(--color-border);
}

.navbar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.5rem;
    font-weight: 700;
}

.logo img {
    width: 36px;
    height: 36px;
    border-radius: 8px;
}

.nav-links {
    display: flex;
    gap: 32px;
}

.nav-links a {
    color: var(--color-text-secondary);
    font-weight: 500;
}

.nav-links a:hover {
    color: var(--color-primary);
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.mobile-menu-btn span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-text);
    transition: var(--transition);
}

/* 移动端展开的导航菜单 */
@media (max-width: 768px) {
    .nav-links.active {
        display: flex;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        flex-direction: column;
        gap: 0;
        padding: 8px 24px 16px;
        background: rgba(7, 20, 15, 0.97);
        border-bottom: 1px solid var(--color-border);
    }

    .nav-links.active a {
        padding: 14px 0;
        border-bottom: 1px solid var(--color-border);
    }

    .nav-links.active a:last-child {
        border-bottom: none;
    }
}

/* Hero Section */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 120px 0 80px;
    overflow: hidden;
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.hero-content {
    position: relative;
    z-index: 2;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--color-text-secondary);
    margin: 24px 0 32px;
    max-width: 500px;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.hero-stats {
    display: flex;
    gap: 40px;
    margin-top: 48px;
    padding-top: 32px;
    border-top: 1px solid var(--color-border);
}

.stat-number {
    display: block;
    font-size: 2rem;
    font-weight: 800;
    color: var(--color-primary);
}

.stat-label {
    color: var(--color-text-muted);
    font-size: 0.9rem;
}

.hero-image {
    position: relative;
    z-index: 2;
}

.phone-mockup {
    position: relative;
    max-width: 320px;
    margin: 0 auto;
}

.phone-mockup img {
    border-radius: 32px;
    border: 1px solid var(--color-border);
    box-shadow: 0 40px 80px rgba(0, 0, 0, 0.55);
}

.floating-card {
    position: absolute;
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
    animation: float 3s ease-in-out infinite;
}

.floating-card.card-1 {
    top: 12%;
    right: -20px;
    animation-delay: 0s;
}

.floating-card.card-2 {
    bottom: 18%;
    left: -20px;
    animation-delay: 1.5s;
}

.card-icon {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(61, 220, 151, 0.16);
    border-radius: 10px;
    font-size: 1.25rem;
}

.card-title {
    display: block;
    font-weight: 600;
    font-size: 0.9rem;
}

.card-value {
    display: block;
    color: var(--color-gold);
    font-size: 0.85rem;
    font-weight: 600;
}

.card-value.mint {
    color: var(--color-primary);
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(circle at 72% 28%, rgba(61, 220, 151, 0.12) 0%, transparent 52%),
        radial-gradient(circle at 20% 80%, rgba(242, 193, 78, 0.07) 0%, transparent 45%),
        linear-gradient(180deg, var(--color-bg-dark) 0%, var(--color-bg-mid) 100%);
    pointer-events: none;
}

/* Section Styles */
section {
    padding: 100px 0;
}

.section-header {
    text-align: center;
    max-width: 640px;
    margin: 0 auto 60px;
}

.section-header p {
    color: var(--color-text-secondary);
    font-size: 1.2rem;
    margin-top: 16px;
}

/* Features Section */
.features {
    background: var(--color-bg-dark);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.feature-card {
    padding: 32px;
    background: var(--color-bg-card);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--color-border);
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-5px);
    border-color: var(--color-border-strong);
    box-shadow: 0 20px 40px rgba(61, 220, 151, 0.08);
}

.feature-icon {
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(61, 220, 151, 0.1);
    border-radius: var(--border-radius);
    color: var(--color-primary);
    margin-bottom: 20px;
}

/* 估值类功能用金色图标，与 App 内"价格一律金色"的规则一致 */
.feature-icon.gold {
    background: rgba(242, 193, 78, 0.1);
    color: var(--color-gold);
}

.feature-card h3 {
    margin-bottom: 12px;
}

.feature-card p {
    color: var(--color-text-secondary);
}

/* How It Works Section */
.how-it-works {
    background: linear-gradient(180deg, var(--color-bg-dark) 0%, var(--color-bg-mid) 100%);
}

.steps {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    max-width: 960px;
    margin: 0 auto;
}

.step {
    padding: 32px;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-lg);
    text-align: center;
}

.step-number {
    width: 56px;
    height: 56px;
    margin: 0 auto 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(90deg, #1FA36C, #5EEBB0, #1FA36C);
    color: #04231A;
    font-size: 1.4rem;
    font-weight: 800;
    border-radius: 50%;
}

.step h3 {
    margin-bottom: 8px;
}

.step p {
    color: var(--color-text-secondary);
}

/* Categories Section */
.categories {
    background: var(--color-bg-mid);
}

.categories-layout {
    display: grid;
    grid-template-columns: 1fr 1.15fr;
    gap: 60px;
    align-items: center;
}

.categories-visual img {
    max-width: 340px;
    border-radius: 24px;
    border: 1px solid var(--color-border);
    box-shadow: 0 30px 60px rgba(0, 0, 0, 0.5);
}

.category-list {
    list-style: none;
    display: grid;
    gap: 12px;
}

.category-list li {
    display: flex;
    align-items: baseline;
    gap: 12px;
    padding: 16px 20px;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.category-list li:hover {
    border-color: var(--color-border-strong);
}

.category-name {
    font-weight: 600;
    white-space: nowrap;
    color: var(--color-primary);
}

.category-desc {
    color: var(--color-text-muted);
    font-size: 0.95rem;
}

/* Premium Section */
.premium {
    background: var(--color-bg-dark);
}

.pricing-cards {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
    max-width: 820px;
    margin: 0 auto;
}

.pricing-card {
    position: relative;
    padding: 40px;
    background: var(--color-bg-card);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--color-border);
    text-align: center;
}

.pricing-card.featured {
    border-color: rgba(242, 193, 78, 0.45);
    box-shadow: 0 20px 60px rgba(242, 193, 78, 0.1);
}

.pricing-badge {
    position: absolute;
    top: -14px;
    left: 50%;
    transform: translateX(-50%);
    padding: 6px 16px;
    background: linear-gradient(90deg, #D9A13A, var(--color-gold-light), #D9A13A);
    color: #2B1D02;
    font-size: 0.85rem;
    font-weight: 700;
    border-radius: 20px;
    white-space: nowrap;
}

.pricing-header h3 {
    font-size: 1.4rem;
    margin-bottom: 16px;
}

.price {
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: 4px;
    margin-bottom: 8px;
    color: var(--color-gold);
}

.price .amount {
    font-size: 2.75rem;
    font-weight: 800;
}

.price .period {
    color: var(--color-text-muted);
    font-size: 1rem;
}

.pricing-header .trial {
    color: var(--color-primary);
    font-weight: 600;
    margin-bottom: 24px;
}

.pricing-features {
    list-style: none;
    text-align: left;
}

.pricing-features li {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 12px 0;
    border-bottom: 1px solid var(--color-border);
    color: var(--color-text-secondary);
}

.pricing-features li:last-child {
    border-bottom: none;
}

.pricing-features svg {
    flex-shrink: 0;
    margin-top: 5px;
    color: var(--color-success);
}

.pricing-note {
    max-width: 820px;
    margin: 32px auto 0;
    text-align: center;
    color: var(--color-text-muted);
    font-size: 0.9rem;
    line-height: 1.8;
}

.pricing-note a {
    color: var(--color-primary);
}

.pricing-note a:hover {
    text-decoration: underline;
}

/* FAQ Section */
.faq {
    background: var(--color-bg-mid);
}

.faq-list {
    max-width: 720px;
    margin: 0 auto;
}

.faq-item {
    border-bottom: 1px solid var(--color-border);
}

.faq-question {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 24px 0;
    background: none;
    border: none;
    color: var(--color-text);
    font-family: inherit;
    font-size: 1.1rem;
    font-weight: 600;
    text-align: left;
    cursor: pointer;
    transition: var(--transition);
}

.faq-question:hover {
    color: var(--color-primary);
}

.faq-question svg {
    flex-shrink: 0;
    transition: var(--transition);
}

.faq-item.active .faq-question svg {
    transform: rotate(180deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.faq-item.active .faq-answer {
    max-height: 320px;
}

.faq-answer p {
    padding-bottom: 24px;
    color: var(--color-text-secondary);
}

/* Download Section */
.download {
    background: linear-gradient(180deg, var(--color-bg-mid) 0%, var(--color-bg-dark) 100%);
    text-align: center;
}

.download-content {
    max-width: 640px;
    margin: 0 auto;
}

.download h2 {
    margin-bottom: 16px;
}

.download-content > p {
    color: var(--color-text-secondary);
    font-size: 1.2rem;
}

.download-buttons {
    display: flex;
    justify-content: center;
    gap: 16px;
    margin: 40px 0 24px;
    flex-wrap: wrap;
}

.store-badge img {
    height: 54px;
    transition: var(--transition);
}

.store-badge:hover img {
    transform: scale(1.05);
}

.download-note {
    color: var(--color-text-muted);
    font-size: 0.9rem;
}

.download-contact {
    margin-top: 12px;
    color: var(--color-text-muted);
    font-size: 0.9rem;
}

.download-contact a {
    color: var(--color-primary);
}

.download-contact a:hover {
    text-decoration: underline;
}

/* Disclaimer */
.disclaimer {
    padding: 0 0 60px;
    background: var(--color-bg-dark);
}

.disclaimer p {
    max-width: 780px;
    margin: 0 auto;
    padding: 20px 24px;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    color: var(--color-text-muted);
    font-size: 0.9rem;
    text-align: center;
    line-height: 1.8;
}

/* Footer */
.footer {
    background: var(--color-bg-dark);
    padding: 60px 0 30px;
    border-top: 1px solid var(--color-border);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 40px;
}

.footer-brand p {
    color: var(--color-text-secondary);
    margin-top: 16px;
    max-width: 300px;
}

.footer-links h4 {
    font-size: 1rem;
    margin-bottom: 16px;
    color: var(--color-text);
}

.footer-links ul {
    list-style: none;
}

.footer-links li {
    margin-bottom: 12px;
}

.footer-links a {
    color: var(--color-text-secondary);
}

.footer-links a:hover {
    color: var(--color-primary);
}

.footer-bottom {
    padding-top: 30px;
    border-top: 1px solid var(--color-border);
    text-align: center;
    color: var(--color-text-muted);
    font-size: 0.9rem;
}

/* Responsive */
@media (max-width: 992px) {
    .hero .container {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-subtitle {
        margin-left: auto;
        margin-right: auto;
    }

    .hero-buttons {
        justify-content: center;
    }

    .hero-stats {
        justify-content: center;
    }

    .hero-image {
        order: -1;
    }

    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .steps {
        grid-template-columns: 1fr;
    }

    .categories-layout {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .categories-visual {
        text-align: center;
    }

    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .navbar > .container > .btn {
        display: none;
    }

    .mobile-menu-btn {
        display: flex;
    }

    .features-grid {
        grid-template-columns: 1fr;
    }

    .pricing-cards {
        grid-template-columns: 1fr;
    }

    .category-list li {
        flex-direction: column;
        gap: 4px;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .footer-brand {
        display: flex;
        flex-direction: column;
        align-items: center;
    }

    .footer-brand p {
        max-width: none;
    }
}

@media (max-width: 480px) {
    .hero-stats {
        flex-direction: column;
        gap: 24px;
    }

    .hero-buttons {
        flex-direction: column;
    }

    .btn-lg {
        width: 100%;
    }

    .floating-card {
        display: none;
    }
}