/* ==========================================================================
 * DSTAIR — How It Works / Methodology
 * Technical patterns, process timeline, sphere icons.
 * ========================================================================== */


/* --------------------------------------------------------------------------
 * § 1. BACKGROUND — DIAGONAL SCAN LINES
 * -------------------------------------------------------------------------- */
.methodology-background {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: var(--z-background);
    background:
        radial-gradient(circle at 50% 0%, rgba(var(--color-primary-rgb), 0.15) 0%, transparent 60%),
        linear-gradient(rgba(var(--color-dark-rgb), 0.98), rgba(var(--color-dark-rgb), 0.98)),
        repeating-linear-gradient(45deg,
            rgba(255, 255, 255, 0.015) 0px,
            rgba(255, 255, 255, 0.015) 2px,
            transparent 2px,
            transparent 20px);
}


/* --------------------------------------------------------------------------
 * § 2. SPHERE ICONS
 * -------------------------------------------------------------------------- */
.sphere-icon {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: rgba(var(--color-primary-rgb), 0.12);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-highlight);
    margin-bottom: 1rem;
    transition: all var(--transition-base);
    border: 1px solid transparent;
}

.sphere-icon:hover {
    background: rgba(var(--color-highlight-rgb), 0.1);
    border-color: rgba(var(--color-highlight-rgb), 0.2);
    box-shadow: var(--shadow-glow-lime);
    transform: scale(1.1);
}


/* --------------------------------------------------------------------------
 * § 3. PROCESS TIMELINE
 * -------------------------------------------------------------------------- */
.process-step {
    border-left: 1px solid var(--white-10);
    padding-left: 2rem;
    position: relative;
    padding-bottom: 3rem;
    transition: border-color var(--transition-slow);
}

.process-step:hover {
    border-left-color: rgba(var(--color-highlight-rgb), 0.3);
}

/* Timeline dot */
.process-step::before {
    content: '';
    position: absolute;
    left: -5px;
    top: 0;
    width: 9px;
    height: 9px;
    border-radius: 50%;
    background: var(--color-highlight);
    box-shadow: 0 0 12px var(--color-highlight);
    transition: all var(--transition-base);
}

.process-step:hover::before {
    transform: scale(1.3);
    box-shadow: 0 0 20px var(--color-highlight);
}

/* Remove border on last step */
.process-step:last-child {
    border-left: none;
    padding-bottom: 0;
}

/* Timeline dot ring animation on hover */
.process-step::after {
    content: '';
    position: absolute;
    left: -9px;
    top: -4px;
    width: 17px;
    height: 17px;
    border-radius: 50%;
    border: 1px solid rgba(var(--color-highlight-rgb), 0);
    transition: all var(--transition-base);
}

.process-step:hover::after {
    border-color: rgba(var(--color-highlight-rgb), 0.4);
}