/* ExploreKeys - Minimal, Elegant CSS */

/* ===== CSS Variables ===== */
:root {
    --bg-primary: #ffffff;
    --bg-secondary: #fafbfc;
    --bg-tertiary: #f0f2f5;
    --text-primary: #1a1a1a;
    --text-secondary: #6b7280;
    --accent: #3b82f6;
    --accent-hover: #2563eb;
    --accent-light: #dbeafe;
    --border: #e5e7eb;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-mono: "SF Mono", Monaco, "Cascadia Code", "Roboto Mono", Consolas, monospace;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-fast: all 0.15s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
    --bg-primary: #0f1419;
    --bg-secondary: #1a1f29;
    --bg-tertiary: #252d3a;
    --text-primary: #f3f4f6;
    --text-secondary: #9ca3af;
    --accent: #60a5fa;
    --accent-hover: #3b82f6;
    --accent-light: #1e3a5f;
    --border: #374151;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -1px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.3), 0 4px 6px -2px rgba(0, 0, 0, 0.2);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.4), 0 10px 10px -5px rgba(0, 0, 0, 0.3);
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    transition: var(--transition);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a {
    color: var(--accent);
    text-decoration: none;
    transition: var(--transition-fast);
    position: relative;
}

a:hover {
    color: var(--accent-hover);
}

a:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
    border-radius: 2px;
}

/* ===== Container ===== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* ===== Header ===== */
.site-header {
    background: rgba(255, 255, 255, 0.8);
    border-bottom: 1px solid var(--border);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    backdrop-filter: blur(12px) saturate(180%);
    -webkit-backdrop-filter: blur(12px) saturate(180%);
}

[data-theme="dark"] .site-header {
    background: rgba(15, 20, 25, 0.8);
}

.site-header nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 2rem;
}

.nav-brand a {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.025em;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
    flex: 1;
}

.nav-menu a {
    color: var(--text-secondary);
    font-weight: 500;
    padding: 0.5rem 0.75rem;
    border-radius: 0.375rem;
    transition: var(--transition-fast);
}

.nav-menu a:hover {
    color: var(--text-primary);
    background: var(--bg-tertiary);
}

.theme-toggle {
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    cursor: pointer;
    padding: 0.5rem 0.75rem;
    color: var(--text-primary);
    transition: var(--transition-fast);
    border-radius: 0.5rem;
    font-size: 1.125rem;
}

.theme-toggle:hover {
    background: var(--border);
    transform: scale(1.05);
}

/* ===== Main Content ===== */
main {
    min-height: calc(100vh - 300px);
    padding: 2rem 0 3rem 0;
}

main > .hero:first-child {
    margin-top: 1rem;
}

/* ===== Hero Section ===== */
.hero {
    text-align: center;
    padding: 5rem 0;
    background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
    border-radius: 1rem;
    margin-bottom: 2rem;
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
    font-weight: 700;
    letter-spacing: -0.025em;
    background: linear-gradient(135deg, var(--accent) 0%, var(--accent-hover) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero p {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.7;
}

/* ===== Cards ===== */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin: 3rem 0;
}

.card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 0.75rem;
    padding: 2rem;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--accent) 0%, var(--accent-hover) 100%);
    opacity: 0;
    transition: var(--transition);
}

.card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
    border-color: var(--accent-light);
}

.card:hover::before {
    opacity: 1;
}

.card h3 {
    margin-bottom: 1rem;
    font-weight: 600;
    letter-spacing: -0.015em;
}

.card p {
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 0;
}

.card .btn {
    display: inline-block;
    margin-top: 1.25rem;
}

/* ===== Page Header ===== */
.page-header {
    margin-bottom: 2rem;
}

.page-header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    letter-spacing: -0.025em;
}

.page-description {
    color: var(--text-secondary);
    font-size: 1.125rem;
    line-height: 1.7;
}

/* ===== Balance Summary ===== */
.balance-summary {
    background: linear-gradient(135deg, var(--accent-light) 0%, var(--bg-secondary) 100%);
    border: 1px solid var(--border);
    border-radius: 0.75rem;
    padding: 1.5rem;
    margin-bottom: 2rem;
    box-shadow: var(--shadow-sm);
}

[data-theme="dark"] .balance-summary {
    background: linear-gradient(135deg, var(--accent-light) 0%, var(--bg-secondary) 100%);
}

.balance-summary-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.balance-item {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.balance-label {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.balance-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--accent);
    font-family: var(--font-mono);
}

/* ===== Key Display ===== */
.key-list {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 0.75rem;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    margin-bottom: 2rem;
}

.key-item {
    padding: 2rem;
    border-bottom: 1px solid var(--border);
    display: grid;
    grid-template-columns: 120px 1fr 150px;
    gap: 2rem;
    align-items: start;
    transition: var(--transition-fast);
    position: relative;
}

.key-item::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 4px;
    background: linear-gradient(180deg, var(--accent) 0%, var(--accent-hover) 100%);
    opacity: 0;
    transition: var(--transition-fast);
}

.key-item:last-child {
    border-bottom: none;
}

.key-item:hover {
    background: var(--bg-tertiary);
}

.key-item:hover::before {
    opacity: 1;
}

/* Key Number */
.key-number {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    padding: 1rem;
    background: var(--bg-primary);
    border-radius: 0.5rem;
    border: 1px solid var(--border);
    text-align: center;
}

.key-number-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 600;
}

.key-number-value {
    font-family: var(--font-mono);
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--accent);
}

/* Key Data */
.key-data {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.key-row {
    display: grid;
    grid-template-columns: 100px 1fr;
    gap: 1rem;
    align-items: center;
}

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

.key-value-group {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.key-value {
    font-family: var(--font-mono);
    font-size: 0.875rem;
    color: var(--text-primary);
    word-break: break-all;
    flex: 1;
    min-width: 0;
}

.key-value.decimal-value {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.copy-btn,
.external-link {
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: 0.375rem;
    padding: 0.375rem 0.5rem;
    cursor: pointer;
    transition: var(--transition-fast);
    font-size: 0.875rem;
    text-decoration: none;
}

.copy-btn:hover,
.external-link:hover {
    background: var(--border);
    transform: scale(1.05);
}

.copy-btn:active {
    transform: scale(0.95);
}

/* Key Status */
.key-status {
    display: flex;
    align-items: center;
    justify-content: center;
}

.key-balance {
    padding: 0.5rem 1rem;
    border-radius: 0.5rem;
    font-size: 0.875rem;
    font-weight: 600;
    text-align: center;
    white-space: nowrap;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    min-width: 120px;
    justify-content: center;
}

.balance-spinner {
    animation: spin 1s linear infinite;
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.balance-zero {
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    border: 1px solid var(--border);
}

.balance-positive {
    background: var(--success);
    color: white;
    box-shadow: var(--shadow-sm);
}

.balance-used {
    background: var(--warning);
    color: #000;
    box-shadow: var(--shadow-sm);
}

/* ===== Pagination ===== */
.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 0.5rem;
    margin: 2rem 0;
    flex-wrap: wrap;
}

.pagination a,
.pagination span {
    padding: 0.625rem 1rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 0.5rem;
    transition: var(--transition-fast);
    font-weight: 500;
    min-width: 2.5rem;
    text-align: center;
}

.pagination a:hover {
    background: var(--bg-tertiary);
    border-color: var(--accent);
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

.pagination .current {
    background: var(--accent);
    color: white;
    border-color: var(--accent);
    box-shadow: var(--shadow-sm);
}

/* Pagination Jump Form */
.pagination-jump {
    display: flex;
    gap: 0.5rem;
    align-items: center;
    margin-left: 1rem;
}

.pagination-jump input {
    width: 100px;
    padding: 0.625rem 0.75rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 0.5rem;
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 0.875rem;
    transition: var(--transition-fast);
}

.pagination-jump input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-light);
    background: var(--bg-primary);
}

.pagination-jump button {
    padding: 0.625rem 1rem;
    min-width: auto;
    font-size: 0.875rem;
}

/* ===== Forms ===== */
.form-group {
    margin-bottom: 1.5rem;
}

label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
}

input[type="text"],
input[type="search"],
textarea {
    width: 100%;
    padding: 0.75rem 1rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 0.5rem;
    color: var(--text-primary);
    font-family: var(--font-mono);
    transition: var(--transition-fast);
    font-size: 0.9375rem;
}

input:focus,
textarea:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-light);
    background: var(--bg-primary);
}

button,
.btn {
    padding: 0.75rem 1.5rem;
    background: var(--accent);
    color: white;
    border: none;
    border-radius: 0.5rem;
    cursor: pointer;
    font-weight: 500;
    transition: var(--transition-fast);
    box-shadow: var(--shadow-sm);
    font-size: 0.9375rem;
}

button:hover,
.btn:hover {
    background: var(--accent-hover);
    box-shadow: var(--shadow);
    transform: translateY(-1px);
}

button:active,
.btn:active {
    transform: translateY(0);
}

.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border);
}

.btn-secondary:hover {
    background: var(--border);
}

/* ===== Search ===== */
.search-form {
    max-width: 600px;
    margin: 0 auto;
}

.search-input-group {
    display: flex;
    gap: 0.5rem;
}

.search-input-group input {
    flex: 1;
}

/* ===== Stats ===== */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin: 3rem 0;
}

.stat-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 0.75rem;
    padding: 2rem;
    text-align: center;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
}

.stat-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
    border-color: var(--accent-light);
}

.stat-value {
    font-size: 2.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--accent) 0%, var(--accent-hover) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.5rem;
    letter-spacing: -0.025em;
}

.stat-label {
    color: var(--text-secondary);
    font-weight: 500;
}

/* ===== Footer ===== */
.site-footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border);
    padding: 3rem 0 1.5rem;
    margin-top: 4rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h3,
.footer-section h4 {
    margin-bottom: 1rem;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 0.5rem;
}

.footer-section a {
    color: var(--text-secondary);
}

.footer-section a:hover {
    color: var(--text-primary);
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid var(--border);
    color: var(--text-secondary);
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .hero {
        padding: 3rem 1rem;
    }

    .hero h1 {
        font-size: 2rem;
    }

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

    .nav-menu {
        display: none;
    }

    .page-header h1 {
        font-size: 1.75rem;
    }

    .page-description {
        font-size: 1rem;
    }

    .balance-summary-content {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .balance-value {
        font-size: 1.25rem;
    }

    .key-item {
        grid-template-columns: 1fr;
        gap: 1.5rem;
        padding: 1.5rem;
    }

    .key-item:hover {
        padding-left: 1.5rem;
    }

    .key-number {
        padding: 0.75rem;
    }

    .key-row {
        grid-template-columns: 1fr;
        gap: 0.5rem;
    }

    .key-label {
        font-size: 0.75rem;
    }

    .key-value {
        font-size: 0.8125rem;
    }

    .key-status {
        justify-content: flex-start;
    }

    .stat-value {
        font-size: 2rem;
    }

    .card-grid {
        gap: 1.5rem;
    }

    .pagination {
        gap: 0.25rem;
    }

    .pagination a,
    .pagination span {
        padding: 0.5rem 0.75rem;
        font-size: 0.875rem;
        min-width: 2rem;
    }

    .pagination-jump {
        width: 100%;
        margin-left: 0;
        margin-top: 0.5rem;
    }

    .pagination-jump input {
        flex: 1;
    }
}

/* ===== Utilities ===== */
.text-center {
    text-align: center;
}

.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 2rem; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 2rem; }

.mono {
    font-family: var(--font-mono);
}

/* ===== Animations ===== */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.card,
.key-list,
.stat-card {
    animation: fadeIn 0.5s ease-out;
}

/* Smooth scrollbar */
::-webkit-scrollbar {
    width: 12px;
    height: 12px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 6px;
    border: 2px solid var(--bg-secondary);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}

/* Selection */
::selection {
    background: var(--accent-light);
    color: var(--text-primary);
}

[data-theme="dark"] ::selection {
    background: var(--accent-light);
    color: var(--text-primary);
}