/* iStarEcho Coming Soon Page
 * Design principles: night sky, whitespace, restraint
 */

/* ============================================================
 * Reset + 基礎變數
 * ============================================================ */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* 色系：深藍夜空 + 星光 */
    --color-bg: #0a0e27;          /* 深藍夜空 */
    --color-bg-soft: #131838;     /* 稍亮的夜空 */
    --color-star: #e8d5a4;        /* 星光金 */
    --color-star-soft: #f4e8c8;   /* 柔星光 */
    --color-text: #d8d6c8;        /* 主文字、柔白 */
    --color-text-dim: #8a8676;    /* 次文字 */
    --color-accent: #f5d1d8;      /* 強調粉 */

    /* 字體 */
    --font-zh: "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", sans-serif;
    --font-en: "Cormorant Garamond", "Inter", -apple-system, BlinkMacSystemFont, sans-serif;

    /* 間距 */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 2rem;
    --space-lg: 4rem;
    --space-xl: 6rem;
}

/* ============================================================
 * Body + 背景（星空、漸層）
 * ============================================================ */

body {
    font-family: var(--font-zh);
    color: var(--color-text);
    background: linear-gradient(180deg, #0a0e27 0%, #131838 100%);
    min-height: 100vh;
    line-height: 1.7;
    overflow-x: hidden;

    /* 微星空背景（CSS-only、不用圖） */
    background-image:
        radial-gradient(2px 2px at 20% 30%, var(--color-star-soft), transparent),
        radial-gradient(1px 1px at 60% 70%, var(--color-star), transparent),
        radial-gradient(1px 1px at 80% 20%, var(--color-star-soft), transparent),
        radial-gradient(2px 2px at 40% 80%, var(--color-star), transparent),
        linear-gradient(180deg, #0a0e27 0%, #131838 100%);
    background-size: 200% 200%, 200% 200%, 200% 200%, 200% 200%, 100% 100%;
    background-attachment: fixed;
}

/* ============================================================
 * 語言切換器（右上角）
 * ============================================================ */

.lang-switcher {
    position: fixed;
    top: var(--space-md);
    right: var(--space-md);
    display: flex;
    gap: var(--space-xs);
    z-index: 100;
    animation: fadeIn 1.5s ease-out;
}

.lang-btn {
    background: transparent;
    border: 1px solid var(--color-text-dim);
    color: var(--color-text-dim);
    padding: 0.35rem 0.7rem;
    font-family: var(--font-zh);
    font-size: 0.8rem;
    border-radius: 3px;
    cursor: pointer;
    transition: all 0.3s ease;
    letter-spacing: 0.05em;
}

.lang-btn:hover {
    color: var(--color-star);
    border-color: var(--color-star);
}

.lang-btn.active {
    color: var(--color-bg);
    background: var(--color-star);
    border-color: var(--color-star);
    font-weight: 500;
}

@media (max-width: 600px) {
    .lang-switcher {
        top: var(--space-sm);
        right: var(--space-sm);
    }
    .lang-btn {
        font-size: 0.7rem;
        padding: 0.25rem 0.5rem;
    }
}

/* ============================================================
 * 主容器
 * ============================================================ */

.container {
    max-width: 720px;
    margin: 0 auto;
    padding: var(--space-xl) var(--space-md);
    text-align: center;
}

/* ============================================================
 * Hero（品牌標題）
 * ============================================================ */

.hero {
    margin-bottom: var(--space-xl);
    animation: fadeIn 1.5s ease-out;
}

.brand {
    font-family: var(--font-en);
    font-weight: 300;
    letter-spacing: 0.05em;
    margin-bottom: var(--space-md);
}

.brand-en {
    display: block;
    font-size: clamp(3rem, 8vw, 5rem);
    color: var(--color-star);
    line-height: 1.1;
    font-style: italic;
}

.brand-zh {
    display: block;
    font-family: var(--font-zh);
    font-size: clamp(1.5rem, 4vw, 2rem);
    color: var(--color-text);
    margin-top: var(--space-xs);
    letter-spacing: 0.3em;
    font-weight: 200;
}

.tagline {
    font-size: clamp(1rem, 2.5vw, 1.25rem);
    color: var(--color-text);
    line-height: 2;
    margin-top: var(--space-md);
}

.tagline-sub {
    color: var(--color-text-dim);
    font-size: 0.95em;
}

/* ============================================================
 * Philosophy 區塊
 * ============================================================ */

.philosophy {
    margin: var(--space-xl) 0;
    animation: fadeIn 2s ease-out 0.3s backwards;
}

.philosophy-main {
    font-size: clamp(1.05rem, 2.2vw, 1.25rem);
    margin-bottom: var(--space-md);
    color: var(--color-star-soft);
    letter-spacing: 0.05em;
    line-height: 1.9;
}

.philosophy-list {
    list-style: none;
    padding: 0;
    margin: var(--space-md) 0;
}

.philosophy-list li {
    font-size: clamp(1rem, 2vw, 1.15rem);
    margin: var(--space-sm) 0;
    color: var(--color-text);
    letter-spacing: 0.08em;
    line-height: 2;
    position: relative;
}

.philosophy-list li::before {
    content: "✦";
    color: var(--color-star);
    margin-right: 0.6em;
    font-size: 0.85em;
    opacity: 0.7;
}

/* ============================================================
 * Philosophy C：商業差異化哲學（A+C 混搭、5/17 志華 ack）
 * ============================================================ */

.philosophy-c {
    margin: var(--space-xl) 0;
    padding: var(--space-md) 0;
    text-align: center;
    border-top: 1px solid rgba(232, 213, 164, 0.15);
    border-bottom: 1px solid rgba(232, 213, 164, 0.15);
    animation: fadeIn 2.8s ease-out 0.9s backwards;
}

.philosophy-c-line1 {
    font-size: clamp(1.05rem, 2.3vw, 1.3rem);
    color: var(--color-star-soft);
    letter-spacing: 0.08em;
    line-height: 1.9;
    margin-bottom: var(--space-xs);
    font-style: italic;
    opacity: 0.9;
}

.philosophy-c-line2 {
    font-size: clamp(1.15rem, 2.5vw, 1.4rem);
    color: var(--color-star);
    letter-spacing: 0.1em;
    line-height: 1.9;
    font-weight: 500;
}

/* ============================================================
 * Coming Soon 區塊
 * ============================================================ */

.coming-soon {
    margin: var(--space-xl) 0 var(--space-lg);
    animation: fadeIn 2.5s ease-out 0.6s backwards;
    padding: var(--space-md);
}

.release-date {
    font-family: var(--font-en);
    font-size: clamp(1.5rem, 3.5vw, 2rem);
    color: var(--color-star);
    letter-spacing: 0.15em;
    font-style: italic;
    font-weight: 400;
    display: block;
    line-height: 1.5;
}

/* ============================================================
 * Email 訂閱表單
 * ============================================================ */

.subscribe {
    margin: var(--space-lg) 0;
    animation: fadeIn 3s ease-out 0.9s backwards;
}

#subscribe-form {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    max-width: 400px;
    margin: 0 auto;
}

@media (min-width: 600px) {
    #subscribe-form {
        flex-direction: row;
    }
}

#email {
    flex: 1;
    padding: var(--space-sm) var(--space-md);
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--color-text-dim);
    border-radius: 4px;
    color: var(--color-text);
    font-family: var(--font-zh);
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

#email:focus {
    outline: none;
    border-color: var(--color-star);
}

#email::placeholder {
    color: var(--color-text-dim);
}

button[type="submit"] {
    padding: var(--space-sm) var(--space-md);
    background: var(--color-star);
    color: var(--color-bg);
    border: none;
    border-radius: 4px;
    font-family: var(--font-zh);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    white-space: nowrap;
}

button[type="submit"]:hover {
    background: var(--color-star-soft);
    transform: translateY(-1px);
}

.subscribe-note {
    margin-top: var(--space-md);
    font-size: 0.875rem;
    color: var(--color-text-dim);
}

/* ============================================================
 * Footer
 * ============================================================ */

.footer {
    margin-top: var(--space-xl);
    padding: var(--space-md);
    text-align: center;
    color: var(--color-text-dim);
    font-size: 0.875rem;
}

.footer-contact {
    color: var(--color-star-soft);
    font-size: 0.875em;
    text-decoration: none;
    letter-spacing: 0.05em;
    line-height: 2;
    transition: color 0.3s ease, opacity 0.3s ease;
    opacity: 0.85;
}

.footer-contact:hover,
.footer-contact:focus {
    color: var(--color-star);
    opacity: 1;
    text-decoration: underline;
    text-underline-offset: 3px;
}

.footer-sub {
    color: var(--color-accent);
    font-size: 0.8em;
}

/* ============================================================
 * 動畫
 * ============================================================ */

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ============================================================
 * 無障礙 (a11y)
 * ============================================================ */

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

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

/* ============================================================
 * 響應式微調
 * ============================================================ */

@media (max-width: 480px) {
    .container {
        padding: var(--space-lg) var(--space-md);
    }

    .philosophy {
        margin: var(--space-lg) 0;
    }
}