/* ===== CSS Variables - Design System ===== */
:root {
    /* Color Palette - Romantic Pink + Gold */
    --color-primary: #DB2777;
    --color-primary-light: #F472B6;
    --color-primary-dark: #BE185D;
    --color-secondary: #FDF2F8;
    --color-accent: #CA8A04;
    --color-accent-light: #EAB308;
    --color-text: #831843;
    --color-text-light: #9D174D;
    --color-white: #FFFFFF;
    --color-white-alpha-10: rgba(255, 255, 255, 0.1);
    --color-white-alpha-20: rgba(255, 255, 255, 0.2);
    --color-white-alpha-30: rgba(255, 255, 255, 0.3);
    --color-white-alpha-50: rgba(255, 255, 255, 0.5);
    --color-white-alpha-70: rgba(255, 255, 255, 0.7);
    --color-white-alpha-80: rgba(255, 255, 255, 0.8);
    --color-white-alpha-90: rgba(255, 255, 255, 0.9);

    /* Typography */
    --font-script: 'Great Vibes', cursive;
    --font-body: 'Cormorant Infant', serif;

    /* Effects */
    --blur-amount: 15px;
    --shadow-soft: 0 4px 20px rgba(219, 39, 119, 0.15);
    --shadow-glow: 0 0 30px rgba(219, 39, 119, 0.3);
    --shadow-card: 0 10px 40px rgba(0, 0, 0, 0.15);
    --transition-fast: 150ms ease-out;
    --transition-normal: 250ms ease-out;
    --transition-slow: 400ms ease-out;

    /* Spacing */
    --nav-height: 0px;
}

/* ===== 基础样式重置 ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html, body {
    width: 100%;
    height: 100%;
    overflow-x: hidden;
}

body {
    font-family: var(--font-body);
    background: linear-gradient(135deg, var(--color-primary-light) 0%, var(--color-secondary) 50%, #fce7f3 100%);
    background-size: 400% 400%;
    animation: gradientBG 20s ease infinite;
    min-height: 100vh;
    position: relative;
    color: var(--color-text);
}

/* Reduced Motion Support */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }

    body {
        animation: none;
        background-size: 100% 100%;
    }
}

@keyframes gradientBG {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

/* ===== 心形动画Canvas ===== */
#hearts-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 1;
}

/* ===== 主容器 ===== */
.container {
    position: relative;
    z-index: 2;
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
}

/* ===== 头部标题 ===== */
.top-names {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
    padding-top: 25px;
    font-family: var(--font-body);
    font-size: 1.4rem;
    font-weight: 500;
    color: var(--color-primary);
    text-shadow: 1px 1px 2px rgba(255, 255, 255, 0.8);
    letter-spacing: 2px;
    animation: fadeInDown 0.8s ease-out;
}

.top-names .heart-icon {
    color: #e11d48;
    font-size: 1.2rem;
    animation: heartbeat 1.2s ease-in-out infinite;
}

@keyframes heartbeat {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.2);
    }
}

.header {
    text-align: center;
    margin-bottom: 20px;
    padding-top: 10px;
}

.title {
    font-family: var(--font-script);
    font-size: 3.5rem;
    color: var(--color-text);
    text-shadow: 2px 2px 4px rgba(255, 255, 255, 0.8), 0 0 20px rgba(255, 255, 255, 0.6);
    margin-bottom: 0;
    animation: fadeInDown 1s ease-out;
    letter-spacing: 3px;
}

@keyframes glowPulse {
    0%, 100% {
        text-shadow: 2px 2px 4px rgba(255, 255, 255, 0.8), 0 0 20px rgba(255, 255, 255, 0.6);
    }
    50% {
        text-shadow: 2px 2px 4px rgba(255, 255, 255, 0.8), 0 0 40px rgba(255, 255, 255, 0.8), 0 0 60px rgba(219, 39, 119, 0.4);
    }
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ===== 照片轮播 ===== */
.carousel-container {
    width: 100%;
    max-width: 700px;
    margin: 20px auto;
}

.carousel {
    position: relative;
    width: 100%;
    aspect-ratio: 3/2;
    border-radius: 24px;
    overflow: hidden;
    box-shadow: var(--shadow-card), var(--shadow-glow);
    background: var(--color-white-alpha-30);
    backdrop-filter: blur(var(--blur-amount));
    -webkit-backdrop-filter: blur(var(--blur-amount));
    border: 1px solid var(--color-white-alpha-20);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.carousel:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-card), 0 0 50px rgba(219, 39, 119, 0.4);
}

.carousel-inner {
    position: relative;
    width: 100%;
    height: 100%;
}

.carousel-slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    transition: opacity 0.8s ease-in-out;
}

.carousel-slide.active {
    opacity: 1;
}

.carousel-slide img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 20px;
}

/* 占位图样式 */
.placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-secondary) 0%, #fce7f3 50%, #fbcfe8 100%);
    border-radius: 24px;
}

.placeholder-icon {
    font-size: 4rem;
    margin-bottom: 15px;
    filter: drop-shadow(0 2px 8px rgba(219, 39, 119, 0.2));
}

.placeholder-text {
    font-family: var(--font-body);
    font-size: 1.1rem;
    color: var(--color-text-light);
    text-align: center;
    padding: 0 20px;
    font-weight: 500;
}

/* 轮播按钮 - 隐藏 */
.carousel-btn {
    display: none;
}

/* 指示器 */
.carousel-indicators {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-top: 20px;
}

.indicator {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--color-white-alpha-50);
    cursor: pointer;
    transition: all var(--transition-normal);
    border: none;
    padding: 0;
    font: inherit;
}

.indicator:hover {
    background: var(--color-white-alpha-80);
}

.indicator:focus {
    outline: none;
    box-shadow: 0 0 0 3px var(--color-primary-light);
}

.indicator.active {
    background: var(--color-white);
    transform: scale(1.3);
    box-shadow: 0 0 15px rgba(255, 255, 255, 0.6), 0 0 30px rgba(219, 39, 119, 0.3);
}

/* ===== 祝福语 ===== */
.message-container {
    margin: 40px 0;
    text-align: center;
    min-height: 100px;
    padding: 20px;
    background: rgba(255, 255, 255, 0.6);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: 16px;
    max-width: 600px;
    box-shadow: 0 4px 20px rgba(219, 39, 119, 0.1);
}

.message {
    font-family: var(--font-body);
    font-size: 1.4rem;
    font-weight: 600;
    color: var(--color-text);
    text-shadow: none;
    line-height: 2;
    max-width: 100%;
    padding: 0;
    letter-spacing: 1px;
}

.message .cursor {
    display: inline-block;
    width: 2px;
    height: 1.4rem;
    background: var(--color-primary);
    animation: blink 0.8s infinite;
    vertical-align: middle;
    margin-left: 3px;
}

@keyframes blink {
    0%, 50% { opacity: 1; }
    51%, 100% { opacity: 0; }
}

/* ===== 音乐控制 ===== */
.music-control {
    display: flex;
    align-items: center;
    gap: 12px;
    margin: 30px 0;
    padding: 15px 25px;
    background: rgba(255, 255, 255, 0.6);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: 50px;
    box-shadow: 0 4px 15px rgba(219, 39, 119, 0.1);
}

.music-btn {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    border: 2px solid var(--color-primary-light);
    background: rgba(255, 255, 255, 0.8);
    cursor: pointer;
    transition: all var(--transition-normal);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-soft);
}

.music-btn:hover {
    background: var(--color-white);
    transform: scale(1.08);
    box-shadow: var(--shadow-glow);
}

.music-btn:focus {
    outline: none;
    box-shadow: 0 0 0 3px var(--color-primary-light);
}

.music-btn.playing {
    animation: musicPulse 1.5s ease-in-out infinite;
    border-color: var(--color-accent);
    background: var(--color-white);
}

.music-icon {
    font-size: 1.5rem;
    color: var(--color-primary);
}

@keyframes musicPulse {
    0%, 100% {
        transform: scale(1);
        box-shadow: var(--shadow-soft);
    }
    50% {
        transform: scale(1.08);
        box-shadow: 0 0 25px rgba(202, 138, 4, 0.5), var(--shadow-glow);
    }
}

.music-status {
    font-family: var(--font-body);
    color: var(--color-text);
    font-size: 1rem;
    font-weight: 600;
}

/* ===== 底部 ===== */
.footer {
    margin-top: auto;
    padding: 30px 0;
    text-align: center;
    color: var(--color-text);
}

.footer-names {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    font-family: var(--font-script);
    font-size: 2rem;
    margin-bottom: 8px;
    text-shadow: 1px 1px 3px rgba(255, 255, 255, 0.8);
}

.footer-names span {
    font-family: var(--font-script);
}

.footer-names .heart-small {
    color: #e11d48;
    font-size: 1rem;
    animation: heartbeat 1.2s ease-in-out infinite;
}

.footer .date {
    font-family: var(--font-body);
    font-size: 1.1rem;
    font-weight: 600;
    letter-spacing: 4px;
    text-shadow: 1px 1px 2px rgba(255, 255, 255, 0.8);
}

/* ===== 响应式设计 ===== */
@media (max-width: 768px) {
    :root {
        --blur-amount: 12px;
    }

    .title {
        font-size: 3rem;
    }

    .subtitle {
        font-size: 1.2rem;
    }

    .carousel-container {
        max-width: 95%;
    }

    .carousel {
        aspect-ratio: 4/3;
    }

    .carousel-btn {
        width: 40px;
        height: 40px;
        font-size: 1rem;
    }

    .message {
        font-size: 1.2rem;
    }

    .message-container {
        padding: 15px;
        margin: 30px 10px;
    }

    .container {
        padding: 15px;
    }

    .footer p {
        font-size: 1.6rem;
    }

    .music-control {
        padding: 12px 20px;
    }

    .music-btn {
        width: 44px;
        height: 44px;
    }
}

@media (max-width: 480px) {
    .title {
        font-size: 2.4rem;
    }

    .subtitle {
        font-size: 1rem;
        letter-spacing: 2px;
    }

    .carousel-container {
        max-width: 100%;
    }

    .carousel {
        aspect-ratio: 1/1;
    }

    .carousel-btn {
        width: 36px;
        height: 36px;
        font-size: 0.9rem;
    }

    .prev-btn {
        left: 8px;
    }

    .next-btn {
        right: 8px;
    }

    .message {
        font-size: 1.1rem;
    }

    .message-container {
        padding: 12px;
        margin: 25px 5px;
    }

    .music-btn {
        width: 40px;
        height: 40px;
    }

    .music-icon {
        font-size: 1.2rem;
    }

    .music-control {
        padding: 10px 15px;
    }

    .placeholder-icon {
        font-size: 3rem;
    }

    .placeholder-text {
        font-size: 0.9rem;
    }

    .footer p {
        font-size: 1.4rem;
    }

    .footer .date {
        font-size: 1rem;
        letter-spacing: 3px;
    }
}

/* ===== 触摸设备优化 ===== */
@media (hover: none) {
    .carousel:hover {
        transform: none;
    }

    .music-btn:hover {
        transform: none;
    }
}