/* ===================================
   CSS Variables & Design Tokens
   =================================== */
:root {
    /* Color Palette */
    --color-primary: #3B82F6;
    --color-primary-light: #60A5FA;
    --color-secondary: #8B5CF6;
    --color-success: #10B981;
    --color-warning: #F59E0B;
    --color-danger: #EF4444;
    --color-info: #3B82F6;
    --color-bg: #F8FAFC;
    --color-text: #1E293B;
    --color-text-muted: #475569;
    --color-border: #E2E8F0;

    /* 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);
    /* Removed border to match My IP */
}

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

.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;
}

/* ===================================
   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;
    max-width: 800px;
    margin: 0 auto;
}

/* ===================================
   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);
    margin-bottom: var(--spacing-md);
}

.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);
}

/* ===================================
   Input Card
   =================================== */
.input-card {
    animation: fadeInUp 0.8s ease-out 0.2s both;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.input-group label {
    font-weight: 600;
    color: var(--color-text);
    font-size: 1rem;
}

.input-wrapper {
    display: flex;
    gap: var(--spacing-sm);
}

.input-wrapper input {
    flex: 1;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-size: 1rem;
    font-family: var(--font-family);
    transition: all var(--transition-normal);
    background: white;
}

.input-wrapper input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.submit-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-lg);
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    color: white;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-normal);
    white-space: nowrap;
}

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

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

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

/* ===================================
   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-spinner {
    width: 60px;
    height: 60px;
    border: 4px solid var(--color-border);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

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

/* ===================================
   Result Area
   =================================== */
.result-area {
    animation: fadeInUp 0.8s ease-out;
}

/* ===================================
   Security Card
   =================================== */
.security-card {
    padding: var(--spacing-lg);
}

.security-card.safe {
    border-left: 4px solid var(--color-success);
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.05), rgba(16, 185, 129, 0.02));
}

.security-card.warning {
    border-left: 4px solid var(--color-warning);
    background: linear-gradient(135deg, rgba(245, 158, 11, 0.05), rgba(245, 158, 11, 0.02));
}

.security-card.danger {
    border-left: 4px solid var(--color-danger);
    background: linear-gradient(135deg, rgba(239, 68, 68, 0.05), rgba(239, 68, 68, 0.02));
}

.security-card.info {
    border-left: 4px solid var(--color-info);
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.05), rgba(59, 130, 246, 0.02));
}

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

.security-icon {
    width: 28px;
    height: 28px;
}

.security-card.safe .security-icon {
    color: var(--color-success);
}

.security-card.warning .security-icon {
    color: var(--color-warning);
}

.security-card.danger .security-icon {
    color: var(--color-danger);
}

.security-card.info .security-icon {
    color: var(--color-info);
}

.security-title {
    font-size: 1.25rem;
    font-weight: 600;
}

.security-message {
    color: var(--color-text-muted);
    line-height: 1.6;
}

/* ===================================
   Result Card
   =================================== */
.result-card {
    padding: var(--spacing-lg);
}

.result-content {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.result-item {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.result-label {
    font-weight: 600;
    color: var(--color-text-muted);
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.result-value {
    font-size: 1.125rem;
    color: var(--color-text);
    word-break: break-all;
}

.url-container {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
    background: rgba(59, 130, 246, 0.05);
    border-radius: var(--radius-sm);
    border: 1px solid rgba(59, 130, 246, 0.1);
}

.result-url {
    flex: 1;
    color: var(--color-primary);
    text-decoration: none;
    font-weight: 500;
    word-break: break-all;
    transition: color var(--transition-fast);
}

.result-url:hover {
    color: var(--color-secondary);
    text-decoration: underline;
}

.copy-btn-small {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background: var(--color-primary);
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-normal);
    flex-shrink: 0;
}

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

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

.copy-icon {
    width: 18px;
    height: 18px;
    color: white;
}

/* ===================================
   Server Info
   =================================== */
.server-info {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background: rgba(148, 163, 184, 0.05);
    border-radius: var(--radius-sm);
    border-top: 1px solid var(--color-border);
}

.info-item {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.info-label {
    font-weight: 600;
    color: var(--color-text-muted);
    font-size: 0.875rem;
}

.info-value {
    font-weight: 600;
    color: var(--color-text);
    font-size: 1rem;
}

/* ===================================
   Error Area
   =================================== */
.error-area {
    animation: fadeInUp 0.8s ease-out;
}

.error-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xl);
    text-align: center;
}

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

.error-text {
    color: var(--color-text-muted);
    font-size: 1.125rem;
    line-height: 1.6;
}

/* ===================================
   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);
    }

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

    .nav-brand {
        gap: var(--spacing-xs);
        padding-left: 10px;
        /* Keep user request */
    }

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

    .nav-link span {
        display: none;
        /* Hide nav link text on mobile to match screenshot */
    }

    /* 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 */
    }

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

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

    .input-wrapper {
        flex-direction: column;
    }

    .submit-btn {
        width: 100%;
        justify-content: center;
    }

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

@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%;
        padding-left: 10px;
        /* Conserve previous mobile padding */
    }

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

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

    .nav-link {
        padding: 6px 10px;
        background: rgba(59, 130, 246, 0.05);
    }

    .nav-link span {
        display: none;
    }

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

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

    .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,
input:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}