/* ===================================
   CSS Variables & Design Tokens
   =================================== */
:root {
    /* Color Palette - Service Landing Page */
    --color-primary: #3B82F6;
    --color-primary-light: #60A5FA;
    --color-secondary: #8B5CF6;
    --color-cta: #F97316;
    --color-cta-hover: #EA580C;
    --color-bg: #F8FAFC;
    --color-text: #1E293B;
    --color-text-muted: #475569;
    --color-border: #E2E8F0;

    /* Dark Mode Colors */
    --color-bg-dark: #0F172A;
    --color-card-dark: rgba(30, 41, 59, 0.5);
    --color-text-dark: #F1F5F9;
    --color-border-dark: rgba(148, 163, 184, 0.2);

    /* Glassmorphism */
    --glass-bg: rgba(255, 255, 255, 0.85);
    --glass-border: rgba(255, 255, 255, 0.3);
    --glass-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.15);

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;

    /* Border Radius */
    --radius-sm: 0.5rem;
    --radius-md: 1rem;
    --radius-lg: 1.5rem;

    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-normal: 250ms ease-in-out;
    --transition-slow: 400ms ease-in-out;
}

/* ===================================
   Reset & Base Styles
   =================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    overflow-x: hidden;
    min-height: 100vh;
    position: relative;
}

/* ===================================
   Background Gradient
   =================================== */
.bg-gradient {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    background: linear-gradient(135deg,
            #667eea 0%,
            #764ba2 25%,
            #f093fb 50%,
            #4facfe 75%,
            #00f2fe 100%);
    background-size: 400% 400%;
    animation: gradientShift 15s ease infinite;
    opacity: 0.15;
}

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

    50% {
        background-position: 100% 50%;
    }

    100% {
        background-position: 0% 50%;
    }
}

/* ===================================
   Floating Navbar
   =================================== */
.navbar {
    position: fixed;
    top: var(--spacing-md);
    left: var(--spacing-md);
    right: var(--spacing-md);
    z-index: 1000;
    animation: slideDown 0.6s ease-out;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--glass-shadow);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.nav-icon {
    width: 32px;
    height: 32px;
    color: var(--color-primary);
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0.7;
    }
}

.nav-title {
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-links {
    display: flex;
    gap: var(--spacing-md);
}

.nav-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-md);
    color: var(--color-text);
    text-decoration: none;
    font-weight: 500;
    border-radius: var(--radius-sm);
    transition: all var(--transition-normal);
    cursor: pointer;
}

.nav-link:hover {
    background: rgba(59, 130, 246, 0.1);
    color: var(--color-primary);
    transform: translateY(-2px);
}

.link-icon {
    width: 20px;
    height: 20px;
}

/* ===================================
   Language Switcher
   =================================== */
.lang-switcher {
    display: flex;
    gap: var(--spacing-xs);
    padding: 4px;
    background: rgba(255, 255, 255, 0.5);
    border-radius: var(--radius-sm);
}

.lang-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    background: transparent;
    border: none;
    border-radius: calc(var(--radius-sm) - 2px);
    color: var(--color-text-muted);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    font-family: var(--font-family);
    text-decoration: none;
    /* Removed underline */
}

.lang-btn:hover {
    background: rgba(59, 130, 246, 0.1);
    color: var(--color-primary);
}

.lang-btn.active {
    background: var(--color-primary);
    color: white;
}

.lang-btn.active:hover {
    background: var(--color-primary-light);
}

.lang-icon {
    width: 16px;
    height: 16px;
}

.lang-btn span {
    white-space: nowrap;
}


/* ===================================
   Main Container
   =================================== */
.main-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: calc(80px + var(--spacing-xl)) var(--spacing-md) var(--spacing-md);
    min-height: calc(100vh - 100px);
}

/* ===================================
   Hero Section
   =================================== */
.hero-section {
    text-align: center;
    margin-bottom: var(--spacing-xl);
    animation: fadeInUp 0.8s ease-out;
}

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

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero-title {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--color-text-muted);
    font-weight: 400;
}

/* ===================================
   Loading State
   =================================== */
.loading-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xl);
    animation: fadeIn 0.5s ease-out;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

.loading-icon {
    display: inline-block;
    font-size: 4rem;
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
}

.loading-text {
    margin-top: var(--spacing-md);
    color: var(--color-text-muted);
    font-size: 1.125rem;
}

/* ===================================
   Error State
   =================================== */
.error-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xl);
    animation: fadeIn 0.5s ease-out;
}

.error-icon {
    width: 64px;
    height: 64px;
    color: #EF4444;
    margin-bottom: var(--spacing-md);
}

.error-text {
    color: var(--color-text-muted);
    font-size: 1.125rem;
    margin-bottom: var(--spacing-md);
}

.retry-btn {
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--color-primary);
    color: white;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-normal);
}

.retry-btn:hover {
    background: var(--color-primary-light);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

/* ===================================
   IP Info Grid
   =================================== */
.ip-info-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
    animation: fadeInUp 0.8s ease-out;
}

/* 特定卡片的網格位置 */
.ip-main-card {
    grid-column: 1 / -1;
    /* 佔滿整列 */
}

.location-card {
    grid-column: 1;
    grid-row: 2;
}

.network-card {
    grid-column: 2;
    grid-row: 2;
}

.timezone-card {
    grid-column: 1;
    grid-row: 3;
}

.coordinates-card {
    grid-column: 2;
    grid-row: 3;
}

.map-card {
    grid-column: 1 / -1;
    /* 佔滿整列 */
}


/* ===================================
   Glass Cards
   =================================== */
.glass-card {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    box-shadow: var(--glass-shadow);
    transition: all var(--transition-normal);
    cursor: default;
}

.glass-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 40px 0 rgba(31, 38, 135, 0.25);
}

.card-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.card-icon {
    width: 24px;
    height: 24px;
    color: var(--color-primary);
}

.card-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-text);
}

/* ===================================
   IP Main Card
   =================================== */
.ip-main-card {
    text-align: center;
    padding: var(--spacing-xl);
}

.ip-address {
    font-size: 3rem;
    font-weight: 700;
    color: var(--color-primary);
    margin: var(--spacing-md) 0;
    font-family: 'Courier New', monospace;
    letter-spacing: 2px;
    word-break: break-all;
    overflow-wrap: break-word;
    max-width: 100%;
}

.ip-address-container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    margin: var(--spacing-md) 0;
}

.copy-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    background: rgba(59, 130, 246, 0.1);
    border: 2px solid var(--color-primary);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-normal);
    position: relative;
}

.copy-btn:hover {
    background: var(--color-primary);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

.copy-btn:hover .copy-icon {
    color: white;
}

.copy-btn:active {
    transform: translateY(0);
}

.copy-icon,
.check-icon {
    width: 24px;
    height: 24px;
    color: var(--color-primary);
    transition: all var(--transition-fast);
}

.copy-btn:hover .copy-icon {
    color: white;
}

.check-icon {
    color: #10B981;
}

.copy-btn.copied {
    background: #10B981;
    border-color: #10B981;
}

.copy-btn.copied .check-icon {
    color: white;
}


.ip-type {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-md);
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    color: white;
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* ===================================
   IP Version Switcher
   =================================== */
.ip-version-switcher {
    display: flex;
    gap: var(--spacing-xs);
    justify-content: center;
    margin-bottom: var(--spacing-md);
    padding: 4px;
    background: rgba(255, 255, 255, 0.5);
    border-radius: var(--radius-sm);
    width: fit-content;
    margin-left: auto;
    margin-right: auto;
}

.ip-version-btn {
    display: flex;
    align-items: center;
    padding: 8px 20px;
    background: transparent;
    border: none;
    border-radius: calc(var(--radius-sm) - 2px);
    color: var(--color-text-muted);
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    font-family: var(--font-family);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.ip-version-btn:hover {
    background: rgba(59, 130, 246, 0.1);
    color: var(--color-primary);
}

.ip-version-btn.active {
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    color: white;
}

.ip-version-btn.active:hover {
    background: linear-gradient(135deg, var(--color-primary-light), var(--color-secondary));
}

.ip-version-btn:disabled {
    cursor: not-allowed;
    opacity: 1;
    background: rgba(148, 163, 184, 0.1);
    color: #94A3B8;
    border: 1px solid rgba(148, 163, 184, 0.3);
}

.ip-version-btn:disabled:hover {
    background: rgba(148, 163, 184, 0.1);
    color: #94A3B8;
    transform: none;
}


/* IP Display Areas */
.ip-display {
    display: none;
    animation: fadeIn 0.3s ease-in-out;
}

.ip-display.active {
    display: block;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}


/* ===================================
   Info List
   =================================== */
.info-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.info-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm);
    background: rgba(255, 255, 255, 0.5);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.info-item:hover {
    background: rgba(255, 255, 255, 0.8);
    transform: translateX(4px);
}

.info-label {
    font-weight: 500;
    color: var(--color-text-muted);
    font-size: 0.875rem;
}

.info-value {
    font-weight: 600;
    color: var(--color-text);
    text-align: right;
}

/* ===================================
   Map Card
   =================================== */
.map-card {
    grid-column: 1 / -1;
    padding: var(--spacing-md);
}

.map-container {
    width: 100%;
    height: 400px;
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
}

.map-view {
    width: 100%;
    height: 100%;
}

/* ===================================
   Footer
   =================================== */
.footer {
    margin-top: var(--spacing-md);
    padding: var(--spacing-lg) var(--spacing-md);
    text-align: center;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
}

.footer-text {
    color: var(--color-text-muted);
    font-size: 0.875rem;
}

.footer-link {
    color: var(--color-primary);
    text-decoration: none;
    font-weight: 600;
    transition: color var(--transition-fast);
}

.footer-link:hover {
    color: var(--color-secondary);
}

/* ===================================
   Responsive Design
   =================================== */
@media (max-width: 768px) {
    .navbar {
        top: var(--spacing-sm);
        left: var(--spacing-sm);
        right: var(--spacing-sm);
    }

    .nav-container {
        padding: var(--spacing-sm) var(--spacing-xs);
        /* Reduce side padding */
    }

    .nav-links {
        gap: var(--spacing-xs);
        /* Reduce gap between elements */
    }

    .nav-brand {
        gap: var(--spacing-xs);
    }

    .nav-title {
        font-size: 1.25rem;
    }

    .nav-link span {
        display: inline-block;
        font-size: 0.75rem;
    }

    /* Allow text labels to be visible on mobile */
    .lang-btn span {
        display: inline-block;
        font-size: 0.75rem;
        /* Smaller font for mobile */
    }

    .lang-btn {
        padding: 4px 8px;
        /* Compact padding */
    }

    .lang-switcher {
        margin-left: 20px;
    }

    .hero-title {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

    .ip-address {
        font-size: 2rem;
    }

    .ip-info-grid {
        grid-template-columns: 1fr;
    }

    /* 重置所有卡片的網格位置為自動 */
    .location-card,
    .network-card,
    .timezone-card,
    .coordinates-card {
        grid-column: auto;
        grid-row: auto;
    }


    .map-container {
        height: 300px;
    }
}

@media (max-width: 480px) {
    .main-container {
        /* Increased padding to prevent navbar/ads covering content */
        padding: calc(150px + var(--spacing-md)) var(--spacing-sm) var(--spacing-md);
    }

    /* Navbar 兩列佈局 */
    .nav-container {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-xs);
        padding: var(--spacing-sm);
    }

    .nav-brand {
        width: 100%;
    }

    .nav-links {
        width: 100%;
        justify-content: flex-end;
        gap: var(--spacing-sm);
    }

    .nav-title {
        white-space: nowrap;
        font-size: 1.25rem;
    }

    /* 恢復顯示首頁圖示，但隱藏文字以節省空間 */
    .nav-link {
        padding: 6px 10px;
        background: rgba(59, 130, 246, 0.05);
    }

    .nav-link span {
        display: none;
    }

    .nav-link .link-icon {
        display: block;
        width: 20px;
        height: 20px;
    }

    .lang-switcher {
        margin-left: 0;
    }

    .hero-title {
        font-size: 1.75rem;
    }

    .ip-address {
        font-size: 1.8rem;
        letter-spacing: 1px;
    }

    .glass-card {
        padding: var(--spacing-sm);
    }
}

/* ===================================
   Accessibility
   =================================== */
@media (prefers-reduced-motion: reduce) {

    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus Styles for Keyboard Navigation */
a:focus-visible,
button:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* ===================================
   Print Styles
   =================================== */
@media print {

    .navbar,
    .footer,
    .bg-gradient {
        display: none;
    }

    .glass-card {
        border: 1px solid var(--color-border);
        box-shadow: none;
        page-break-inside: avoid;
    }
}