/* =========================================
   SpeedTest — Modern Minimalist Theme
   ========================================= */

@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
    /* Background & surface */
    --clr-bg: #0c0e14;
    --clr-surface: #151820;
    --clr-surface-2: #1c2030;
    --clr-border: rgba(255, 255, 255, 0.06);

    /* Text */
    --clr-text: #e8eaf0;
    --clr-text-dim: #6b7280;
    --clr-text-accent: #a5b4fc;

    /* Gauge colors */
    --clr-track: #1e2235;
    --clr-accent-low: #22d3ee;
    --clr-accent-mid: #818cf8;
    --clr-accent-high: #f472b6;
    --clr-tick: #2a3050;

    /* Misc */
    --clr-btn: #818cf8;
    --clr-btn-hover: #6366f1;
    --clr-success: #34d399;
    --radius: 16px;
    --radius-sm: 10px;
    --font: 'DM Sans', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

body {
    font-family: var(--font);
    background: var(--clr-bg);
    color: var(--clr-text);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

/* Background texture */
body::before {
    content: '';
    position: fixed;
    inset: 0;
    background:
        radial-gradient(ellipse 80% 60% at 50% 0%, rgba(99, 102, 241, 0.08), transparent),
        radial-gradient(ellipse 50% 40% at 80% 100%, rgba(244, 114, 182, 0.05), transparent);
    pointer-events: none;
    z-index: 0;
}

/* ── Header ── */
.header {
    position: relative;
    z-index: 10;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 32px;
    max-width: 960px;
    width: 100%;
    margin: 0 auto;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
}

.logo-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--clr-accent-low), var(--clr-accent-mid));
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.logo-icon svg {
    width: 22px;
    height: 22px;
    fill: white;
}

.logo-text {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--clr-text);
    letter-spacing: -0.02em;
}

.lang-toggle {
    display: flex;
    gap: 2px;
    background: var(--clr-surface);
    border-radius: 8px;
    padding: 3px;
    border: 1px solid var(--clr-border);
}

.lang-btn {
    padding: 6px 14px;
    font-size: 0.8rem;
    font-weight: 600;
    font-family: var(--font);
    color: var(--clr-text-dim);
    background: transparent;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    transition: var(--transition);
}

.lang-btn.active {
    background: var(--clr-surface-2);
    color: var(--clr-text);
}

.lang-btn:hover:not(.active) {
    color: var(--clr-text);
}

/* ── Main ── */
.main {
    position: relative;
    z-index: 10;
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    max-width: 960px;
    width: 100%;
    margin: 0 auto;
    padding: 0 24px 60px;
}

/* ── Gauge Section ── */
.gauge-section {
    text-align: center;
    margin-bottom: 40px;
}

.gauge-container {
    position: relative;
    width: 400px;
    height: 400px;
    margin: 0 auto 24px;
}

#gauge-svg {
    width: 100%;
    height: 100%;
}

.gauge-value {
    font-family: var(--font-mono);
    font-size: 54px;
    font-weight: 700;
    fill: var(--clr-text);
    letter-spacing: -0.04em;
}

.gauge-unit {
    font-family: var(--font);
    font-size: 16px;
    font-weight: 500;
    fill: var(--clr-text-dim);
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.gauge-phase {
    font-family: var(--font);
    font-size: 13px;
    fill: var(--clr-text-accent);
    font-weight: 500;
}

.gauge-tick-label {
    font-family: var(--font-mono);
    font-size: 11px;
    fill: var(--clr-text-dim);
}

/* Start button */
.btn-start {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 14px 48px;
    font-family: var(--font);
    font-size: 1rem;
    font-weight: 600;
    color: #fff;
    background: var(--clr-btn);
    border: none;
    border-radius: 50px;
    cursor: pointer;
    transition: var(--transition);
    letter-spacing: 0.01em;
    position: relative;
    overflow: hidden;
}

.btn-start::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, transparent, rgba(255,255,255,0.1));
    opacity: 0;
    transition: var(--transition);
}

.btn-start:hover:not(:disabled)::before {
    opacity: 1;
}

.btn-start:hover:not(:disabled) {
    background: var(--clr-btn-hover);
    transform: translateY(-2px);
    box-shadow: 0 8px 32px rgba(99, 102, 241, 0.3);
}

.btn-start:active:not(:disabled) {
    transform: translateY(0);
}

.btn-start:disabled {
    cursor: not-allowed;
    opacity: 0.7;
}

.btn-start.testing {
    animation: pulse-btn 1.5s ease-in-out infinite;
}

@keyframes pulse-btn {
    0%, 100% { box-shadow: 0 0 0 0 rgba(129, 140, 248, 0.4); }
    50% { box-shadow: 0 0 0 16px rgba(129, 140, 248, 0); }
}

/* ── Results Panel ── */
.results-panel {
    display: flex;
    gap: 24px;
    width: 100%;
    max-width: 600px;
    margin: 32px auto;
    opacity: 0;
    transform: translateY(12px);
    transition: var(--transition);
    pointer-events: none;
}

.results-panel.visible {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
}

.result-card {
    flex: 1;
    background: var(--clr-surface);
    border: 1px solid var(--clr-border);
    border-radius: var(--radius-sm);
    padding: 20px;
    text-align: center;
}

.result-card__label {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--clr-text-dim);
    margin-bottom: 8px;
}

.result-card__value {
    font-family: var(--font-mono);
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--clr-text);
}

.result-card:nth-child(1) .result-card__value { color: var(--clr-accent-low); }
.result-card:nth-child(2) .result-card__value { color: var(--clr-accent-mid); }
.result-card:nth-child(3) .result-card__value { color: var(--clr-accent-high); }

/* ── User Info Cards ── */
.info-section {
    width: 100%;
    margin-top: 16px;
}

.info-section__title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--clr-text);
    margin-bottom: 16px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--clr-border);
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 12px;
}

.info-card {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
    background: var(--clr-surface);
    border: 1px solid var(--clr-border);
    border-radius: var(--radius-sm);
    padding: 14px 18px;
    transition: var(--transition);
}

.info-card:hover {
    border-color: rgba(255, 255, 255, 0.1);
}

.info-card__label {
    font-size: 0.8rem;
    color: var(--clr-text-dim);
    font-weight: 500;
    white-space: nowrap;
}

.info-card__value {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--clr-text);
    text-align: right;
    word-break: break-all;
}

/* ── Tech Info ── */
.tech-section {
    width: 100%;
    margin-top: 40px;
    background: var(--clr-surface);
    border: 1px solid var(--clr-border);
    border-radius: var(--radius);
    overflow: hidden;
}

.tech-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 18px 24px;
    border-bottom: 1px solid var(--clr-border);
    cursor: pointer;
    transition: var(--transition);
}

.tech-header:hover {
    background: var(--clr-surface-2);
}

.tech-header__title {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--clr-text);
    display: flex;
    align-items: center;
    gap: 8px;
}

.tech-header__chevron {
    transition: transform 0.3s;
    color: var(--clr-text-dim);
}

.tech-section.open .tech-header__chevron {
    transform: rotate(180deg);
}

.tech-body {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease;
}

.tech-section.open .tech-body {
    max-height: 800px;
}

.tech-body__inner {
    padding: 16px 24px 20px;
}

.tech-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 0;
    border-bottom: 1px solid var(--clr-border);
}

.tech-row:last-child {
    border-bottom: none;
}

.tech-label {
    font-size: 0.82rem;
    color: var(--clr-text-dim);
}

.tech-value {
    font-family: var(--font-mono);
    font-size: 0.82rem;
    color: var(--clr-text);
    text-align: right;
}

.btn-copy {
    font-family: var(--font);
    font-size: 0.78rem;
    font-weight: 500;
    color: var(--clr-text-accent);
    background: none;
    border: 1px solid var(--clr-border);
    border-radius: 6px;
    padding: 6px 14px;
    cursor: pointer;
    transition: var(--transition);
}

.btn-copy:hover {
    background: var(--clr-surface-2);
    border-color: var(--clr-text-accent);
}

.btn-copy.copied {
    color: var(--clr-success);
    border-color: var(--clr-success);
}

/* ── Footer ── */
.footer {
    position: relative;
    z-index: 10;
    text-align: center;
    padding: 24px;
    font-size: 0.78rem;
    color: var(--clr-text-dim);
}

/* ── Responsive ── */
@media (max-width: 640px) {
    .header {
        padding: 16px 20px;
    }

    .main {
        padding: 0 16px 40px;
    }

    .gauge-container {
        width: 300px;
        height: 300px;
    }

    .gauge-value {
        font-size: 40px;
    }

    .results-panel {
        flex-direction: column;
        gap: 12px;
    }

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

    .btn-start {
        padding: 12px 36px;
    }

    .tech-header,
    .tech-body__inner {
        padding-left: 16px;
        padding-right: 16px;
    }
}

/* ── Animations ── */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.gauge-section { animation: fadeInUp 0.6s ease-out; }
.info-section { animation: fadeInUp 0.6s ease-out 0.1s both; }
.tech-section { animation: fadeInUp 0.6s ease-out 0.2s both; }