:root {
    --primary: #0d47a1;
    --primary-dark: #0a387a;
    --primary-light: #1565c0;
    --surface: #fff;
    --surface-alt: #f5f7fa;
    --surface-dark: #e8ecf1;
    --text-primary: #1a1a2e;
    --text-secondary: #5a6573;
    --text-muted: #8b95a5;
    --success: #2e7d32;
    --success-light: #e8f5e9;
    --warning: #ed6c02;
    --warning-light: #fff3e0;
    --error: #d32f2f;
    --error-light: #ffebee;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12)
}

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

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--surface-alt);
    min-height: 100vh
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 16px
}

@media(min-width:768px) {
    .container {
        padding: 0 24px
    }
}

.site-header {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: var(--surface);
    padding: 32px 0;
    position: relative;
    overflow: hidden
}

    .site-header::before {
        content: '';
        position: absolute;
        top: -50%;
        right: -20%;
        width: 600px;
        height: 600px;
        background: rgba(255, 255, 255, 0.03);
        border-radius: 50%
    }

.header-content {
    position: relative;
    z-index: 1
}

.brand-title {
    font-size: clamp(1.5rem, 4vw, 2.25rem);
    font-weight: 700;
    margin-bottom: 8px
}

.brand-subtitle {
    font-size: clamp(0.95rem, 2vw, 1.1rem);
    opacity: 0.9;
    margin-bottom: 20px
}

.meta-banner {
    display: flex;
    flex-wrap: wrap;
    gap: 12px 24px;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(8px);
    padding: 12px 16px;
    border-radius: var(--radius-md);
    border: 1px solid rgba(255, 255, 255, 0.15)
}

.meta-item {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.85rem
}

.meta-value {
    font-weight: 600
}

.status-badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    background: var(--success);
    color: #fff;
    padding: 2px 8px;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600
}

    .status-badge::before {
        content: '';
        width: 6px;
        height: 6px;
        background: #fff;
        border-radius: 50%
    }

.main-content {
    padding: 32px 0 48px
}

.dashboard-section {
    margin-bottom: 32px
}

.section-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 8px
}

.section-desc {
    color: var(--text-secondary);
    margin-bottom: 20px;
    font-size: 0.95rem
}

.distribution-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px
}

@media(min-width:768px) {
    .distribution-grid {
        grid-template-columns: 1fr 1fr
    }
}

.download-card {
    background: var(--surface);
    border-radius: var(--radius-lg);
    padding: 24px;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--surface-dark);
    display: flex;
    flex-direction: column;
    transition: all .2s ease
}

    .download-card:hover {
        box-shadow: var(--shadow-lg);
        transform: translateY(-2px)
    }

.card-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px
}

.card-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0
}

    .card-icon.primary {
        background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
        color: #fff
    }

    .card-icon.secondary {
        background: var(--surface-alt);
        color: var(--primary);
        border: 2px solid var(--surface-dark)
    }

.card-title {
    font-size: 1.1rem;
    font-weight: 600
}

.card-context {
    font-size: 0.8rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-weight: 500
}

.card-body {
    flex: 1
}

.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    width: 100%;
    min-height: 56px;
    padding: 14px 24px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    color: #fff;
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    transition: all .2s ease;
    box-shadow: 0 4px 12px rgba(13, 71, 161, 0.3);
    margin-top: 16px
}

    .download-btn:hover {
        background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
        box-shadow: 0 6px 20px rgba(13, 71, 161, 0.4);
        transform: translateY(-1px)
    }

    .download-btn:active {
        transform: translateY(0);
        box-shadow: 0 2px 8px rgba(13, 71, 161, 0.3)
    }

    .download-btn svg {
        width: 20px;
        height: 20px
    }

.file-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 12px;
    padding-top: 12px;
    border-top: 1px solid var(--surface-dark)
}

.file-meta-item {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.85rem;
    color: var(--text-secondary)
}

    .file-meta-item svg {
        width: 16px;
        height: 16px;
        color: var(--text-muted)
    }

.qr-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 20px;
    background: var(--surface-alt);
    border-radius: var(--radius-md);
    border: 2px dashed var(--surface-dark)
}

.qr-code {
    width: 450px;
    height: 450px;
    background: var(--surface);
    border-radius: var(--radius-sm);
    padding: 12px;
    box-shadow: var(--shadow-sm);
    display: flex;
    align-items: center;
    justify-content: center
}

    .qr-code img {
        width: 100%;
        height: 100%;
        object-fit: contain;
        border-radius: var(--radius-sm);
        display: block;
    }

/* .qr-pattern {
    width: 100%;
    height: 100%;
    position: relative;
    background-image: repeating-linear-gradient(0deg, var(--text-primary) 0px, var(--text-primary) 8px, transparent 8px, transparent 12px), repeating-linear-gradient(90deg, var(--text-primary) 0px, var(--text-primary) 8px, transparent 8px, transparent 12px);
    background-size: 100% 100%, 100% 100%
} */

.qr-pattern::before,
.qr-pattern::after {
    content: '';
    position: absolute;
    width: 36px;
    height: 36px;
    border: 8px solid var(--text-primary);
    background: var(--surface)
}

.qr-pattern::before {
    top: 8px;
    left: 8px
}

.qr-pattern::after {
    top: 8px;
    right: 8px
}

.corner-bl {
    position: absolute;
    bottom: 8px;
    left: 8px;
    width: 36px;
    height: 36px;
    border: 8px solid var(--text-primary);
    background: var(--surface)
}

.qr-label {
    margin-top: 16px;
    text-align: center
}

    .qr-label p {
        font-size: 0.95rem;
        font-weight: 500
    }

    .qr-label span {
        font-size: 0.8rem;
        color: var(--text-muted)
    }

.verification-section {
    background: var(--surface);
    border-radius: var(--radius-lg);
    padding: 24px;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--surface-dark);
    margin-bottom: 32px
}

.verification-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 20px
}

    .verification-header svg {
        width: 24px;
        height: 24px;
        color: var(--success)
    }

.verification-title {
    font-size: 1.1rem;
    font-weight: 600
}

.verification-grid {
    display: grid;
    gap: 16px
}

@media(min-width:768px) {
    .verification-grid {
        grid-template-columns: repeat(3, 1fr)
    }
}

.verify-item {
    padding: 16px;
    background: var(--surface-alt);
    border-radius: var(--radius-md);
    border-left: 4px solid var(--primary)
}

.verify-label {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-muted);
    font-weight: 600;
    margin-bottom: 6px
}

.verify-value {
    font-size: 0.9rem;
    font-weight: 500;
    word-break: break-all
}

.checksum {
    font-family: "SF Mono", Monaco, "Cascadia Code", "Roboto Mono", Consolas, monospace;
    font-size: 0.8rem;
    line-height: 1.5
}

.terminal-block {
    margin-top: 20px;
    background: #1a1a2e;
    border-radius: var(--radius-md);
    padding: 16px;
    overflow-x: auto
}

.terminal-header {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 12px;
    padding-bottom: 12px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1)
}

.terminal-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%
}

    .terminal-dot.red {
        background: #ff5f56
    }

    .terminal-dot.yellow {
        background: #ffbd2e
    }

    .terminal-dot.green {
        background: #27c93f
    }

.terminal-label {
    font-size: 0.75rem;
    color: rgba(255, 255, 255, 0.5);
    margin-left: 4px
}

.terminal-code {
    font-family: "SF Mono", Monaco, "Cascadia Code", "Roboto Mono", Consolas, monospace;
    font-size: 0.85rem;
    color: #a5d6ff;
    line-height: 1.6
}

    .terminal-code .comment {
        color: #6b7280
    }

    .terminal-code .command {
        color: #7ee787
    }

.guide-section {
    margin-bottom: 32px
}

.guide-intro {
    background: linear-gradient(135deg, var(--warning-light) 0%, #fff8e1 100%);
    border: 1px solid #ffcc80;
    border-radius: var(--radius-md);
    padding: 16px 20px;
    margin-bottom: 24px;
    display: flex;
    align-items: flex-start;
    gap: 12px
}

    .guide-intro svg {
        width: 24px;
        height: 24px;
        color: var(--warning);
        flex-shrink: 0;
        margin-top: 2px
    }

    .guide-intro p {
        font-size: 0.95rem;
        line-height: 1.6
    }

    .guide-intro strong {
        color: var(--warning)
    }

.pro-tip-box {
    margin-top: 25px;
    margin-bottom: 25px;
}

.steps-container {
    display: grid;
    gap: 20px
}

@media(min-width:768px) {
    .steps-container {
        grid-template-columns: repeat(3, 1fr)
    }
}

.step-card {
    background: var(--surface);
    border-radius: var(--radius-lg);
    padding: 24px;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--surface-dark);
    position: relative;
    transition: all .2s ease
}

    .step-card:hover {
        box-shadow: var(--shadow-lg)
    }

.step-number {
    position: absolute;
    top: -12px;
    left: 24px;
    width: 32px;
    height: 32px;
    background: var(--primary);
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.9rem;
    box-shadow: var(--shadow-sm)
}

.step-title {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 12px;
    margin-top: 8px
}

.alert-box {
    background: var(--error-light);
    border: 1px solid #ffcdd2;
    border-radius: var(--radius-sm);
    padding: 12px;
    margin-bottom: 12px
}

    .alert-box.warning {
        background: var(--warning-light);
        border-color: #ffcc80
    }

.alert-header {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--error);
    margin-bottom: 6px
}

.alert-box.warning .alert-header {
    color: var(--warning)
}

.alert-text {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.5;
    font-style: italic
}

.action-box {
    background: var(--success-light);
    border: 1px solid #a5d6a7;
    border-radius: var(--radius-sm);
    padding: 12px
}

.action-header {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--success);
    margin-bottom: 6px
}

.action-text {
    font-size: 0.9rem;
    line-height: 1.5;
    font-weight: 500
}

.action-highlight {
    color: var(--success);
    font-weight: 700
}

.site-footer {
    background: var(--text-primary);
    color: var(--surface);
    padding: 32px 0
}

.footer-content {
    display: grid;
    gap: 24px
}

@media(min-width:768px) {
    .footer-content {
        grid-template-columns: 1fr 1fr
    }
}

.footer-section h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--surface)
}

.footer-section p,
.footer-section a {
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.8);
    line-height: 1.6
}

.footer-section a {
    color: #90caf9;
    text-decoration: none;
    transition: all .2s ease
}

    .footer-section a:hover {
        color: var(--surface);
        text-decoration: underline
    }

.contact-item {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 8px
}

    .contact-item svg {
        width: 16px;
        height: 16px;
        color: rgba(255, 255, 255, 0.6)
    }

.safety-banner {
    grid-column: 1/-1;
    background: rgba(211, 47, 47, 0.2);
    border: 1px solid rgba(211, 47, 47, 0.4);
    border-radius: var(--radius-md);
    padding: 16px 20px;
    display: flex;
    align-items: flex-start;
    gap: 12px
}

    .safety-banner svg {
        width: 22px;
        height: 22px;
        color: #ef5350;
        flex-shrink: 0;
        margin-top: 2px
    }

    .safety-banner p {
        font-size: 0.9rem;
        color: rgba(255, 255, 255, 0.9)
    }

    .safety-banner strong {
        color: #ef5350
    }

.footer-bottom {
    margin-top: 24px;
    padding-top: 24px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
    font-size: 0.8rem;
    color: rgba(255, 255, 255, 0.5)
}