/* ===== Layout · Container / Grid / Nav · 深紫色主题版 ===== */

.container {
    width: 100%;
    max-width: var(--container);
    margin: 0 auto;
    padding: 0 var(--sp-7);
}

.container-narrow {
    max-width: var(--container-narrow);
}

.section {
    padding: var(--sp-12) 0;
    position: relative;
}

@media (max-width: 768px) {
    .container { padding: 0 var(--sp-5); }
    .section { padding: var(--sp-9) 0; }
}

/* ===== Top Navigation · 深色毛玻璃效果 ===== */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--nav-h);
    background: rgba(30, 27, 75, 0.85);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    z-index: 100;
    transition: all 0.4s var(--ease);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.nav.scrolled {
    background: rgba(30, 27, 75, 0.95);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.2), 0 4px 12px rgba(0, 0, 0, 0.15);
}

.nav-inner {
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: var(--container);
    margin: 0 auto;
    padding: 0 var(--sp-7);
    gap: var(--sp-6);
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: var(--sp-3);
    text-decoration: none;
}

.nav-brand img {
    height: 40px;
    width: auto;
    display: block;
}

.nav-brand-text {
    display: flex;
    flex-direction: column;
    gap: 2px;
    line-height: 1;
}

.nav-brand-text .cn {
    font-family: var(--font-serif-tc);
    font-size: 1rem;
    font-weight: 600;
    color: #FFFFFF;
    letter-spacing: 0.06em;
    white-space: nowrap;
}

.nav-brand-text .en {
    font-family: var(--font-sans-en);
    font-size: 0.6rem;
    font-weight: 500;
    color: rgba(255,255,255,0.8);
    letter-spacing: 0.18em;
    text-transform: uppercase;
    white-space: normal;
    line-height: 1.2;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--sp-5);
    list-style: none;
}

.nav-links a {
    font-family: var(--font-serif-tc);
    font-size: 0.95rem;
    color: var(--ink-light-soft);
    letter-spacing: 0.06em;
    position: relative;
    padding: 4px 0;
    transition: color 0.3s var(--ease);
    white-space: nowrap;
}

.nav-links a::after {
    content: "";
    position: absolute;
    bottom: -2px;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--primary-gradient);
    border-radius: 2px;
    transition: all 0.4s var(--ease);
    transform: translateX(-50%);
}

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

.nav-links a:hover::after {
    width: 100%;
}

.nav-right {
    display: flex;
    align-items: center;
    gap: var(--sp-4);
    margin-left: var(--sp-6);
}

.nav-lang {
    display: flex;
    align-items: center;
    gap: 0;
    font-family: var(--font-sans-en);
    font-size: 0.75rem;
    letter-spacing: 0.05em;
    color: var(--ink-mute);
}

.nav-lang button {
    color: var(--ink-mute);
    padding: 2px 1px;
    margin: 0;
    border-radius: 4px;
    transition: all 0.3s var(--ease);
}

.nav-lang span {
    margin: 0;
    padding: 0;
}

.nav-lang button.is-active,
.nav-lang button:hover {
    color: var(--accent-purple);
    background: rgba(126, 87, 194, 0.08);
}

.nav-cta {
    display: inline-flex;
    align-items: center;
    gap: var(--sp-2);
    padding: 10px 24px;
    background: var(--purple-gradient);
    color: white;
    border-radius: var(--r-full);
    font-family: var(--font-serif-tc);
    font-size: 0.9rem;
    letter-spacing: 0.08em;
    transition: all 0.3s var(--ease);
    box-shadow: var(--shadow-purple);
    white-space: nowrap;
}

.nav-cta:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 28px rgba(126, 87, 194, 0.35);
}

.nav-cta::after {
    content: "→";
    font-family: var(--font-sans-en);
    transition: transform 0.3s var(--ease);
}

.nav-cta:hover::after {
    transform: translateX(3px);
}

/* Contact Grid - 联系我们卡片网格 */
.apply-contact-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--sp-5);
}
@media (max-width: 768px) {
    .apply-contact-grid { grid-template-columns: 1fr; }
}

/* Faculty Grid - 师资力量网格 */
.faculty-grid-row {
    display: grid;
    gap: var(--sp-5);
}
.faculty-grid-4 {
    grid-template-columns: repeat(4, 1fr);
    margin-bottom: var(--sp-5);
}
.faculty-grid-5 {
    grid-template-columns: repeat(5, 1fr);
}
@media (max-width: 1024px) {
    .faculty-grid-4 { grid-template-columns: repeat(2, 1fr); }
    .faculty-grid-5 { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 768px) {
    .faculty-grid-4 { grid-template-columns: 1fr; }
    .faculty-grid-5 { grid-template-columns: 1fr; }
}

/* Mobile menu toggle */
.nav-toggle {
    display: none;
    width: 28px;
    height: 28px;
    flex-direction: column;
    justify-content: center;
    gap: 6px;
    cursor: pointer;
}

.nav-toggle span {
    display: block;
    width: 22px;
    height: 1.5px;
    background: #FFFFFF;
    transition: all 0.3s var(--ease);
}

.nav-toggle.is-open span:nth-child(1) {
    transform: translateY(3.75px) rotate(45deg);
}
.nav-toggle.is-open span:nth-child(2) {
    transform: translateY(-3.75px) rotate(-45deg);
}

@media (max-width: 900px) {
    .nav-toggle { display: flex; }
    .nav-links {
        position: fixed;
        top: var(--nav-h);
        left: 0;
        right: 0;
        background: linear-gradient(135deg, #8B3F9A 0%, #6E35A1 50%, #5B2C75 100%);
        flex-direction: column;
        align-items: flex-start;
        padding: var(--sp-6) var(--sp-7);
        gap: var(--sp-5);
        box-shadow: var(--shadow-lg);
        transform: translateY(-120%);
        opacity: 0;
        pointer-events: none;
        transition: transform 0.4s var(--ease), opacity 0.4s var(--ease);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
    }
    .nav-links a {
        color: #FFFFFF;
    }
    .nav-links.is-open {
        transform: translateY(0);
        opacity: 1;
        pointer-events: auto;
    }
    .nav-lang { font-size: 0.7rem; gap: 4px; }
    .nav-cta { padding: 10px 18px; font-size: 0.85rem; min-height: 44px; display: inline-flex; align-items: center; }
    .nav-brand-text { display: none; }
}

@media (max-width: 480px) {
    .nav-lang { display: none; }
    .nav-cta { padding: 8px 14px; font-size: 0.78rem; min-height: 44px; }
    .nav-links { padding: var(--sp-5) var(--sp-5); gap: var(--sp-4); }
    .nav-inner { padding: 0 var(--sp-4); }
}

/* ===== Buttons · 蘋果風按鈕 ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--sp-2);
    padding: 14px 36px;
    font-family: var(--font-serif-tc);
    font-size: 0.95rem;
    letter-spacing: 0.08em;
    border-radius: var(--r-full);
    cursor: pointer;
    transition: all 0.4s var(--ease);
}

.btn-primary {
    background: rgba(255,255,255,0.15);
    backdrop-filter: blur(10px);
    color: #FFFFFF;
    border: 1px solid rgba(255,255,255,0.3);
}

.btn-primary.faculty-btn {
    color: #FFD700 !important;
}

.btn-primary:hover {
    background: rgba(255,255,255,0.25);
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(255,255,255,0.15);
}

.btn-ghost {
    background: transparent;
    color: #FFFFFF;
    border: 1.5px solid rgba(255,255,255,0.4);
}

.btn-ghost:hover {
    background: rgba(255,255,255,0.1);
    color: #FFFFFF;
    border-color: rgba(255,255,255,0.6);
}
    border-color: var(--ink);
}

.btn-gold {
    background: var(--primary-gradient);
    color: white;
    box-shadow: var(--shadow-blue);
}

.btn-gold:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 32px rgba(26, 35, 126, 0.35);
}

/* ===== Decorative line ===== */
.gold-line {
    height: 2px;
    background: var(--primary-gradient);
    width: 100%;
    border-radius: 2px;
    opacity: 0.4;
}

.gold-line-left {
    background: linear-gradient(90deg, var(--primary-blue), transparent);
}

/* ===== Reveal animation · 流暢淡入 ===== */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s var(--ease-out), transform 0.8s var(--ease-out);
    will-change: opacity, transform;
}

.reveal.is-visible {
    opacity: 1;
    transform: translateY(0);
}

.reveal[data-delay="1"] { transition-delay: 0.1s; }
.reveal[data-delay="2"] { transition-delay: 0.2s; }
.reveal[data-delay="3"] { transition-delay: 0.3s; }
.reveal[data-delay="4"] { transition-delay: 0.4s; }

/* ===== Sticky floating CTA ===== */
.float-cta {
    position: fixed;
    bottom: 32px;
    right: 32px;
    z-index: 90;
    padding: 14px 28px;
    background: var(--primary-gradient);
    color: white;
    border-radius: var(--r-full);
    font-family: var(--font-serif-tc);
    font-size: 0.9rem;
    letter-spacing: 0.08em;
    box-shadow: var(--shadow-blue);
    transition: all 0.4s var(--ease);
    display: flex;
    align-items: center;
    gap: 8px;
    opacity: 0;
    pointer-events: none;
    transform: translateY(20px);
}

.float-cta.is-shown {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
}

.float-cta:hover {
    transform: translateY(-3px);
    box-shadow: 0 16px 36px rgba(26, 35, 126, 0.4);
}

@media (max-width: 768px) {
    .float-cta { bottom: 20px; right: 20px; padding: 12px 20px; font-size: 0.85rem; }
}

/* ===== Back to top ===== */
.back-to-top {
    position: fixed;
    bottom: 32px;
    left: 32px;
    z-index: 90;
    width: 48px;
    height: 48px;
    border-radius: var(--r-full);
    background: var(--snow);
    color: var(--primary-blue);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    font-weight: 600;
    box-shadow: var(--shadow-lg);
    border: 1px solid rgba(26, 35, 126, 0.1);
    opacity: 0;
    pointer-events: none;
    transition: all 0.4s var(--ease);
}

.back-to-top.is-shown {
    opacity: 1;
    pointer-events: auto;
}

.back-to-top:hover {
    background: var(--primary-blue);
    color: white;
    transform: translateY(-3px);
    box-shadow: var(--shadow-blue);
}