quell Light v1.0.0

Overview & System Role

quell-light.css represents the lean, high-fidelity starter track within the Quell Series framework eco-system. Engineered specifically to minimize initial paint latency and prevent layout thrashing, its core objective is to map a consistent, highly structured design language with near-zero runtime processor overhead. By enforcing a strict set of architectural boundaries, it decouples the layout engine from presentation styling, acting as a clean, rigid wireframe that remains resilient under highly active user interaction.

Strict Architectural Boundaries & Constraints

1. Mobile-First Principals: The stylesheet adheres strictly to progressive enhancement. The basic layout structures, typographic settings, and functional elements (such as buttons, form-controls, and navigation components) are declared first within a mobile-centric footprint (viewports < 768px). Responsive transformations are deferred entirely to the --breakpoint-md (768px) media query block, keeping mobile parsing paths free of unused desktop rules.
2. Flat Specificity Footprint: To protect developers from technical style wars, cascading depth is kept deliberately shallow. Element-selector chains are isolated, class-level definitions remain single-depth where possible, and heavy selector nesting is avoided. Specificity is kept low, enabling seamless down-stream overrides.
3. Intentional Asset Lean-ness: quell-light.css restricts physical footprint by decoupling logic from external payload structures. It avoids complex visual decoration, relying instead on high-contrast system typography, mathematically calibrated layout gaps, and native CSS rendering capabilities.
4. Font Architecture Continuity: The stylesheet contains zero @font-face asset declarations. Reflecting a strict design design choice, font files are not loaded directly by quell-light.css. This keeps the CSS footprint pristine and ensures zero network drag from typography calls. Typography definitions utilize fallback font-stacks that delegate inheritance to the underlying client environment or active downstream theme configurations, allowing instant, layout-stable text rendering.

Architecture & Breakpoint Matrix

The architectural system of quell-light.css is structured into sequential processing layers. This organization establishes a predictable vertical flow, ensuring that variables, global overrides, UI components, and layout systems build cascading layouts deterministically.

Rationale

The sequential execution flow resolves standard cascading conflicts natively. By establishing :root tokens first, elements mapped during base normalization are immediately bound to global constraints (e.g., body inherits var(--color-bg-light)). Color utilities are mapped prior to structural layouts, prioritizing general surface states before sizing constraints. Components are initialized using logical mobile definitions. Finally, spacing utilities and layout overrides behave as “last-priority wrappers”, resolving specific spacing constraints directly before breakpoint modifiers optimize the layout for tablets and desktops. By segregating responsive transformations entirely inside a single, unified @media (min-width: 768px) block, Quell Light avoids the visual jitter and specificity spikes caused by scattering scattered viewport rules across the stylesheet.

Token & System Deep-Dive

This section catalogs every CSS Custom Property defined within the global :root scope.

1. The Core Palette

Colors are declared with solid fallback Hex formats for older engines, paired with advanced OKLCH channels inside a modern @supports (color: oklch()) upgrade rule. This structural choice provides robust backward compatibility alongside precise, modern color rendering.

Rationale

The use of double :root allocations with progressive enhancements via @supports (color: oklch(0% 0 0)) guarantees cross-platform rendering consistency. Legacy layouts fall back cleanly to solid HEX declarations, while modern rendering contexts gain access to device-independent OKLCH color spaces. Dividing colors into Hex, OKLCH components, and RGB maps empowers Quell Light to build real-time transparencies using native CSS variables, preventing the need to duplicate variables or import heavy image files to achieve modern graphic overlays.

2. Spacing, Borders, Shadows, and Utilities

A rigorous, mathematically controlled hierarchy governs spacing, visual depth, and elevation layers.

Spacing, Borders, and Radii Metrics

Visual Elevation, Shadows, and Durations

| Variable Name | Native CSS Value Mapping | Base Alpha Factor | Architectural Intent |
| :--- | :--- | :--- | :--- |
| `--shadow-sm` | `0 var(--spacing-xs) var(--spacing-sm) var(--spacing-neg-xxs) oklch(var(--shadow-black-oklch) / var(--alpha-xs))` | `--alpha-xs` (`0.1`) | Micro shadow for small buttons, alerts, subtle hover layouts. |
| `--shadow-md` | `0 var(--spacing-sm) var(--spacing-md) var(--spacing-neg-xs) oklch(var(--shadow-black-oklch) / var(--alpha-sm))` | `--alpha-sm` (`0.125`) | Canonical card depth shadow; safe for general app interfaces. |
| `--shadow-lg` | `0 var(--spacing-md) var(--spacing-lg) var(--spacing-neg-sm) oklch(var(--shadow-black-oklch) / var(--alpha-md))` | `--alpha-md` (`0.4`) | Heavy card depth; indicates floating, drag-n-drop objects. |
| `--shadow-xl` | `0 var(--spacing-lg) var(--spacing-xl) var(--spacing-neg-md) oklch(var(--shadow-black-oklch) / var(--alpha-lg))` | `--alpha-lg` (`0.6`) | Heavy popups, drop-downs, modal wrappers, sticky bars. |
| `--shadow-elevation-sm` | `0 var(--spacing-xxs) var(--spacing-xs) var(--spacing-neg-xxs) oklch(...)`, `0 var(--spacing-xs) var(--spacing-sm) var(--spacing-neg-xxs) oklch(...)` | Dual Alpha (`0.1` + `0.125`) | Dual layering for flat-looking buttons with highly real depth. |
| `--shadow-elevation-md`| `0 var(--spacing-xs) var(--spacing-sm) var(--spacing-neg-xxs) oklch(...)`, `0 var(--spacing-sm) var(--spacing-md) var(--spacing-neg-xs) oklch(...)` | Dual Alpha (`0.125` + `0.4`) | High visual depth; floating dashboard elements. |
| `--shadow-elevation-lg`| `0 var(--spacing-sm) var(--spacing-md) var(--spacing-neg-xs) oklch(...)`, `0 var(--spacing-md) var(--spacing-lg) var(--spacing-neg-sm) oklch(...)` | Dual Alpha (`0.4` + `0.6`) | Extremely heavy multi-layer shadow. Used on overlays. |
| `--shadow-elevation-xl`| `0 var(--spacing-md) var(--spacing-lg) var(--spacing-neg-sm) oklch(...)`, `0 var(--spacing-lg) var(--spacing-xl) var(--spacing-neg-md) oklch(...)` | Dual Alpha (`0.6` + `0.8`) | Peak elevation layer shadow for modal overlay layers. |
| `--shadow-inset-sm` | `inset 0 var(--spacing-xxs) var(--spacing-xs) oklch(...)` | `--alpha-xs` (`0.1`) | Micro concave surface layout; pressed state indicators. |
| `--shadow-inset-md` | `inset 0 var(--spacing-xs) var(--spacing-sm) oklch(...)` | `--alpha-sm` (`0.125`) | Input field active backgrounds, inner shadow fields. |
| `--shadow-inset-lg` | `inset 0 var(--spacing-sm) var(--spacing-md) oklch(...)` | `--alpha-md` (`0.4`) | Sunken panels, scroll track backdrops. |
| `--shadow-inset-xl` | `inset 0 var(--spacing-md) var(--spacing-lg) oklch(...)` | `--alpha-lg` (`0.6`) | Deep concave graphic zones, simulated frame outlines. |
| `--z-index-hide` | `-1` | Absolute Value | Force layers behind base container layout stacks. |
| `--z-index-default` | `1` | Absolute Value | Standard rendering context baseline. |
| `--z-index-elevated`| `10` | Absolute Value | Drops-downs, relative navbar indicators, alerts. |
| `--z-index-sticky` | `100` | Absolute Value | Non-scrolling layouts, top-level pinned headers. |
| `--z-index-overlay` | `1000` | Absolute Value | Modal backdrops, backdrop click zones. |
| `--z-index-modal` | `1010` | Absolute Value | Modal windows, toast trackers. |
| `--container-width` | `90rem` (1440px) | Maximum Constraint | Centered layout content bounding limit on horizontal displays. |
| `--container-fluid-width`| `100%` | Percent Fluid | Fluid spanning layout boundary. |
| `--one-twelfth` | `8.333333%` | Grid Decimal Constant | Mathematical foundation constant for building 12 column layouts. |
| `--card-width` | `22.5rem` (360px) | Card Fixed Limit | Base maximum boundary of isolated content cards. |
| `--card-fluid-width` | `100%` | Percent Fluid | Adaptive card expansion on mobile screens. |
| `--card-image` | `100%` | Percent Fluid | Locks card head images to maximum bounding parent width. |
| `--icon-base` | `10rem` (160px) | Icon Outer Box | Sizing baseline for decorative system icons. |
| `--transition-speed-fast`| `0.15s` | Time (Seconds) | Instant active changes (hover shifts, toggle clicks). |
| `--transition-speed-normal`| `0.3s` | Time (Seconds) | Default animation length (accordion panels, slide drawers). |
| `--transition-speed-slow`| `0.5s` | Time (Seconds) | Heavy layout transitions (fade overrides on modal display). |
| `--transition-ease` | `ease-in-out` | Cubic bezier curve | Smooth, organic acceleration and deceleration curve. |
| `--min-width-default` | `15rem` (240px) | Absolute Value | Safeguards site structure against shrinking on micro screens. |

Rationale

Spacing leverages a continuous, mathematically optimized 1.5× scale factor. This establishes a predictable rhythm for typographic alignment and layout grids, transforming spacing adjustments into deterministic layout moves. Border radii are normalized to prevent visual inconsistency. Shadows are designed with high semantic intent, pairing basic offsets with elevation variables to convey surface depth layers. Integrating OKLCH calculations directly with opacity metrics allows shadow depth to automatically adapt and scale depending on whether it sits on a light or dark background, preventing grey outlines on dark backgrounds.

3. Responsive Architecture Rules & Fluid Typography

Rather than using discrete breakpoints to snap fonts across viewports, Quell Light enforces clean responsive structures using smooth fluid clamp rules under :root.

Rationale

CSS clamp() enables fluid typography scaling that dynamically responds to screen width changes without requiring multi-step media queries. By combining a fixed fallback (rem) with fluid viewport units (vw) and an upper ceiling, text scales smoothly on any device. This guarantees zoom-safe typography, preventing visual glitches and keeping layouts stable on everything from micro mobile devices to wide-aspect desktop monitors.

The 12-Column Responsive Grid Engine

This section lists the structural utility mechanics and mobile-first container engines that drive Quell Light layouts.

1. Container & Row Mechanics

Layout containment in quell-light.css is structured to ensure content blocks center and pad themselves elegantly across different screen sizes.

Rationale

Using a unified gutter standard based on var(--spacing-md) ensures that fluid elements align with fixed layouts. This simple containment layer provides maximum layout safety with a flat specificity cost.

2. Mobile-First Columns

Mobile styling in Quell Light uses full-width vertical stacking, keeping columns fluid on smaller devices.

Rationale

Mobile-first vertical stacking prevents horizontal scrolling issues on narrow screens. It allows elements to span the full viewport width safely, postponing multi-column arrangements to the tablet/desktop breakpoint.

3. The Breakpoint Mutators

When the screen viewport reaches or passes the --breakpoint-md threshold of 768px (48rem), the responsive layout engine activates. Layouts shift from stacked to multi-column structures using the 12-column grid.

Alignment & Flex Direction Mutators (@media (min-width: 768px))

12-Column Responsive Grid Mutators (@media (min-width: 768px))

Display State Overrides (@media (min-width: 768px))

Rationale

Applying .md\: classes within the (min-width: 768px) media query ensures layout stability across varying display dimensions. Designing column widths via multiplication of --one-twelfth ensures that the 12-column system is perfectly predictable on any screen size. Using !important on .md\:d-none guarantees that desktop-hidden elements remain hidden, overriding normal display styling conflicts.

Technical Elements Specification

A clean, responsive layout needs structured, predictable styles for basic elements to maintain typography and layout rhythm.

1. Element Resets, Base Typographic Mechanics & Anchor Focus Rings

2. Base Utility Layout Classes (Full Metric Manifest, No Placeholders)

These utilities enable precise layout spacing, typography styles, and color adjustments across the application.

Explicit Spacing Matrix (var(--spacing-*) Mapping)

Negative Overlap Marign Utilities

Padding & Gap Spacers Matrix

Static Colors & States Utilities

| Utility Class Name | Targeted Property | CSS Declaration | Visual Layout Intent |
| :--- | :--- | :--- | :--- |
| **Typography Ink Colors** | | | |
| `.text-heading` | `color` | `color: var(--color-primary);` | Forces dark midnight blue brand color. |
| `.text-body` | `color` | `color: var(--color-text-body);` | Forces base body dark grey tone. |
| `.text-on-accent` | `color` | `color: var(--color-text-inverse);` | Contrasts light text over deep color backdrops. |
| `.text-muted` | `color` | `color: var(--color-muted-grey);` | Subdued secondary info output. |
| `.text-success` | `color` | `color: var(--color-success);` | Green notification ink. |
| `.text-info` | `color` | `color: var(--color-info);` | Blue helper ink. |
| `.text-warning` | `color` | `color: var(--color-warning);` | Gold caution ink. |
| `.text-error` | `color` | `color: var(--color-error);` | Red error ink. |
| **Background Utilities** | | | |
| `.bg-light` | `background-color` | `background-color: var(--color-bg-light);` | Soft grey body background. |
| `.bg-dark` | `background-color` / `color` | `background-color: var(--color-primary-dark); color: var(--color-matte-white);` | Dark midnight canvas color backdrop. |
| `.bg-primary` | `background-color` / `color` | `background-color: var(--color-primary); color: var(--color-matte-white);` | Solid brand blue panel. |
| `.bg-accent` | `background-color` / `color` | `background-color: var(--color-accent); color: var(--color-matte-white);` | Bold brand accent highlight backdrop. |
| `.bg-surface` | `background-color` | `background-color: var(--color-surface);` | Grey surface canvas backdrop container. |
| `.bg-primary-light` | `background` / `color` | `background: var(--color-primary-light); color: var(--color-matte-white);` | Lighter blue panel backdrop. |
| `.bg-secondary` | `background-color` / `color` | `background-color: var(--color-secondary); color: var(--color-matte-white);` | Slate neutral backdrop panel. |
| **System States & Borders** | | | |
| `.bg-success` | `background-color` / `color` | `background-color: var(--color-success); color: var(--color-matte-white);` | Success notification block. |
| `.bg-success-light` | `background-color` | `background-color: var(--color-success-light);` | Medium-soft success border. |
| `.bg-success-lighter` | `background-color` | `background-color: var(--color-success-lighter);` | Soft tint panel (alert backdrops). |
| `.bg-success-accent` | `background-color` | `background-color: var(--color-success-accent);` | Solid focus boundary for green buttons. |
| `.bg-info` | `background-color` / `color` | `background-color: var(--color-info); color: var(--color-matte-white);` | Info highlight block. |
| `.bg-info-light` | `background-color` | `background-color: var(--color-info-light);` | Info boundary borders. |
| `.bg-info-lighter` | `background-color` | `background-color: var(--color-info-lighter);` | Soft tint informational panel backdrop. |
| `.bg-info-accent` | `background-color` | `background-color: var(--color-info-accent);` | Focus highlight for info tags. |
| `.bg-warning` | `background-color` / `color` | `background-color: var(--color-warning); color: var(--color-matte-black);` | Yellow alert box backdrop. Keeps black text for WCAG contrast. |
| `.bg-warning-light` | `background-color` | `background-color: var(--color-warning-light);` | Warning borders. |
| `.bg-warning-lighter` | `background-color` | `background-color: var(--color-warning-lighter);` | Soft yellow notice banner backdrop. |
| `.bg-warning-accent` | `background-color` | `background-color: var(--color-warning-accent);` | Solid highlight ring for caution zones. |
| `.bg-error` | `background-color` / `color` | `background-color: var(--color-error); color: var(--color-matte-white);` | Danger/alert background panel. |
| `.bg-error-light` | `background-color` | `background-color: var(--color-error-light);` | Urgent action boundaries. |
| `.bg-error-lighter` | `background-color` | `background-color: var(--color-error-lighter);` | Soft critical failure panel backdrop. |
| `.bg-error-accent` | `background-color` | `background-color: var(--color-error-accent);` | Red focus boundaries. |
| `.border-success` | `border-color` | `border-color: var(--color-success);` | Success state borders. |
| `.border-info` | `border-color` | `border-color: var(--color-info);` | Info state borders. |
| `.border-warning` | `border-color` | `border-color: var(--color-warning);` | Caution state borders. |
| `.border-error` | `border-color` | `border-color: var(--color-error);` | Failure state borders. |

Typography & Visual Sizing Override Utilities

Mobile-First Flexbox Layout Engine

These utilities establish the core flexbox layout system before responsive breakpoint modifiers scale them on larger viewports.

Rationale

Exposing all utility classes explicitly ensures technical clarity, allowing down-stream ingestion engines like NotebookLM to model Quell Light’s visual layout behavior accurately. These properties map structural relationships directly, creating a stable design system free of layout gaps.

3. Core Component Layout Rules

The structural definitions of Quell Light’s baseline interactive elements.

Complete Component Specifications

/* Card Component Block */
.card {
  width:            var(--card-width);             /* 22.5rem / 360px limit */
  background-color: var(--color-surface);          /* Soft white surface */
  border-radius:    var(--border-radius-md);       /* 0.5rem curves */
  padding:          var(--spacing-lg);             /* Generous padding */
  box-shadow:       var(--shadow-md);              /* Soft shadow profile */
}

.card-header {
  padding:       var(--spacing-xs);                /* Tight spacing */
  margin-bottom: var(--spacing-md);                /* Gaps below header */
  border-bottom: var(--border-width-sm) solid var(--color-primary-light); /* Clean divider line */
}

.card-body { 
  padding: var(--spacing-md);                      /* Baseline internal spacing */
}

.card-img  {
  width:   var(--card-image);                      /* Lock images of card tightly */
  height:  auto;
  display: block;
  border-top-left-radius:  var(--border-radius-md); /* Match top corners */
  border-top-right-radius: var(--border-radius-md);
}

/* Alert Notification Engines */
.alert {
  padding:         var(--spacing-md);              /* Outer gutters */
  margin-bottom:   var(--spacing-md);
  border:          var(--border-width-sm) solid transparent;
  border-radius:   var(--border-radius-sm);
  display:         flex;                            /* Horizon alignment */
  align-items:     center;
  justify-content: space-between;
}

.alert-message { 
  flex-grow: 1;                                    /* Expands text area */
}

.alert-close {
  background:  none;
  border:      none;
  font-size:   var(--font-size-lg);
  cursor:      pointer;
  margin-left: var(--spacing-md);
}

.alert-success { 
  color: var(--color-matte-white); 
  background-color: var(--color-success);          /* High-contrast green background */
  border-color: var(--color-success); 
}

.alert-info { 
  color: var(--color-matte-white); 
  background-color: var(--color-info);             /* Informational cyan/blue background */
  border-color: var(--color-info); 
}

/* Note: .alert-warning uses a dark-slate foreground color (--color-secondary).
   This is an intentional layout choice to guarantee WCAG AA contrast ratios, 
   as standard white text fails readability tests when paired with soft gold/yellow backdrops. */
.alert-warning { 
  color: var(--color-secondary); 
  background-color: var(--color-warning); 
  border-color: var(--color-warning); 
  font-weight: bolder; 
}

.alert-error { 
  color: var(--color-matte-white); 
  background-color: var(--color-error);            /* High-alert red background */
  border-color: var(--color-error); 
}

/* Form Controls & Inputs */
.form-control {
  display:          block;
  width:            100%;
  padding:          var(--spacing-sm);             /* Comfort target size */
  font-size:        var(--font-size-base);
  line-height:      var(--line-height-base);
  color:            var(--color-text-body);
  background-color: var(--color-surface);
  background-clip:  padding-box;
  border:           var(--border-width-md) solid var(--color-grey); /* Baseline 2px border */
  border-radius:    var(--border-radius-sm);
  appearance:       none;                          /* Strip browser defaults */
  transition:       border-color var(--transition-speed-normal) var(--transition-ease),
                    box-shadow   var(--transition-speed-normal) var(--transition-ease);
}

.form-control:focus {
  border-color: var(--color-primary-light);        /* Switch outline on hover/focus */
  outline:      none;
  box-shadow:   0 0 0 3px oklch(var(--color-primary-light-oklch) / var(--alpha-sm)); /* Focus glow */
}

.form-control:disabled {
  background-color: var(--color-lighter-grey);     /* Muted disabled state */
  cursor:           not-allowed;
}

.form-control-sm { 
  padding: var(--spacing-xs) var(--spacing-sm); 
  font-size: var(--font-size-sm); 
}

.form-control-lg { 
  padding: var(--spacing-md) var(--spacing-lg); 
  font-size: var(--font-size-lg); 
}

/* Base Navbars */
.navbar {
  display:          flex;
  justify-content:  space-between;
  align-items:      center;
  padding:          var(--spacing-xs) var(--spacing-md);
  background-color: var(--color-primary-light);
  position:         relative;
}

.navbar-brand {
  font-weight:     bold;
  font-size:       var(--font-size-h5);
  text-decoration: none;
  color:           var(--color-matte-white);
}

/* Hamburger menu - builds three line toggle through layout spans */
.nav-toggle {
  display:         flex;
  flex-direction:  column;
  justify-content: space-between;
  width:           var(--spacing-lg);
  height:          var(--spacing-lg);
  padding:         0;
  border:          none;
  background:      transparent;
  cursor:          pointer;
  gap:             4px;
}

.nav-toggle span {
  display:          block;
  width:            100%;
  height:           var(--spacing-xxs);
  background-color: var(--color-surface);
  border-radius:    2px;
  transition:       transform var(--transition-speed-fast)  var(--transition-ease),
                    opacity   var(--transition-speed-fast)  var(--transition-ease); 
}

.navbar-nav {
  display:          none;                          /* Hidden by default on mobile dimensions */
  list-style:       none;
  margin:           0;
  padding:          0;
  flex-direction:   column;
  background-color: var(--color-primary-dark);
  width:            100%;
  position:         absolute;                      /* Dynamic drop-down overlay setup */
  top:              100%;
  left:             0;
  z-index:          var(--z-index-elevated);
  box-shadow:       var(--shadow-md);
}

.navbar-nav.is-open { 
  display: flex;                                   /* Interactive toggle via JS */
}

.nav-item { 
  padding: var(--spacing-sm);
}

.nav-link {
  color:           var(--color-matte-white);
  text-decoration: none;
  transition:      color var(--transition-speed-fast) var(--transition-ease);
}

.nav-link:hover,
.nav-link:focus { 
  color: var(--color-accent); 
}

/* Interactive Button Normalization & Sizing */
.btn {
  display:         inline-block;
  font-family:     var(--font-fam-primary);
  font-size:       var(--font-size-base);
  line-height:     var(--line-height-h5);
  text-align:      center;
  text-decoration: none;
  vertical-align:  middle;
  cursor:          pointer;
  user-select:     none;
  border:          var(--border-width-sm) solid transparent;
  padding:         var(--spacing-sm) var(--spacing-md);
  border-radius:   var(--border-radius-sm);
  transition:      background-color var(--transition-speed-fast),
                   border-color     var(--transition-speed-fast),
                   color            var(--transition-speed-fast),
                   box-shadow       var(--transition-speed-fast);
}

.btn:hover    { background-color: var(--color-primary-light); color: var(--color-matte-white); }
.btn:active   { background-color: var(--color-primary); }
.btn:focus    { outline: var(--border-width-md) solid var(--color-accent); }
.btn:disabled { opacity: 0.6; cursor: not-allowed; pointer-events: none; }

.btn-sm { padding: var(--spacing-xs) var(--spacing-sm); font-size: var(--font-size-sm); }
.btn-md { padding: var(--spacing-sm) var(--spacing-md); font-size: var(--font-size-base); }
.btn-lg { padding: var(--spacing-md) var(--spacing-lg); font-size: var(--font-size-md); }

/* Solid Interactive Variants */
.btn-primary         { background-color: var(--color-primary); color: var(--color-matte-white); border-color: var(--color-primary); }
.btn-primary:hover   { background-color: var(--color-primary-light); border-color: var(--color-primary-light); }

.btn-secondary       { background-color: var(--color-secondary); color: var(--color-matte-white); border-color: var(--color-secondary); }
.btn-secondary:hover { background-color: var(--color-secondary-light); border-color: var(--color-secondary-light); }

.btn-accent          { background-color: var(--color-accent); color: var(--color-matte-white); border-color: var(--color-accent); }
.btn-accent:hover    { background-color: oklch(var(--color-accent-oklch) / var(--alpha-lg)); border-color: oklch(var(--color-accent-oklch) / var(--alpha-xl)); }

.btn-success         { background-color: var(--color-success); color: var(--color-matte-white); border-color: var(--color-success); }
.btn-success:hover   { background-color: oklch(var(--color-success-oklch) / var(--alpha-xl)); border-color: oklch(var(--color-success-oklch) / var(--alpha-xl)); }

.btn-info            { background-color: var(--color-info); color: var(--color-matte-white); border-color: var(--color-info); }
.btn-info:hover      { background-color: oklch(var(--color-info-oklch) / var(--alpha-xl)); border-color: oklch(var(--color-info-oklch) / var(--alpha-xl)); }

/* Warning utilizes dark contrast text to maintain accessibility standards */
.btn-warning         { background-color: var(--color-warning); color: var(--color-secondary); font-weight: bold; border-color: var(--color-warning); }
.btn-warning:hover   { background-color: oklch(var(--color-warning-oklch) / var(--alpha-xl)); border-color: oklch(var(--color-warning-oklch) / var(--alpha-xl)); }

.btn-error           { background-color: var(--color-error); color: var(--color-matte-white); border-color: var(--color-error); }
.btn-error:hover     { background-color: oklch(var(--color-error-oklch) / var(--alpha-xl)); border-color: oklch(var(--color-error-oklch) / var(--alpha-xl)); }

/* Outline Design Variants */
.btn-outline {
  background-color: transparent;
  border:           var(--border-width-sm) solid var(--color-primary);
  color:            var(--color-primary);
  transition:       all var(--transition-speed-normal) var(--transition-ease);
}
.btn-outline:hover { background-color: var(--color-primary); color: var(--color-text-inverse); }
.btn-outline:focus { outline: var(--border-width-md) solid var(--color-accent); outline-offset: var(--border-width-md); }

.btn-outline-primary       { border-color: var(--color-primary); color: var(--color-primary); }
.btn-outline-primary:hover { background-color: var(--color-primary); color: var(--color-text-inverse); }
.btn-outline-primary:focus { outline: var(--border-width-md) solid var(--color-primary); outline-offset: var(--border-width-md); }

.btn-outline-secondary       { border-color: var(--color-secondary); color: var(--color-secondary); }
.btn-outline-secondary:hover { background-color: var(--color-secondary); color: var(--color-text-inverse); }
.btn-outline-secondary:focus { outline: var(--border-width-md) solid var(--color-secondary); outline-offset: var(--border-width-md); }

.btn-outline-accent       { border-color: var(--color-accent); color: var(--color-accent); }
.btn-outline-accent:hover { background-color: var(--color-accent); color: var(--color-text-inverse); }
.btn-outline-accent:focus { outline: var(--border-width-md) solid var(--color-accent); outline-offset: var(--border-width-md); }

.btn-outline-success       { border-color: var(--color-success); color: var(--color-success); }
.btn-outline-success:hover { background-color: var(--color-success); color: var(--color-text-inverse); }
.btn-outline-success:focus { outline: var(--border-width-md) solid var(--color-success); outline-offset: var(--border-width-md); }

.btn-outline-info       { border-color: var(--color-info); color: var(--color-info); }
.btn-outline-info:hover { background-color: var(--color-info); color: var(--color-text-inverse); }
.btn-outline-info:focus { outline: var(--border-width-md) solid var(--color-info); outline-offset: var(--border-width-md); }

.btn-outline-warning       { border-color: var(--color-warning); color: var(--color-warning); }
.btn-outline-warning:hover { background-color: var(--color-warning); color: var(--color-secondary); font-weight: bold; }
.btn-outline-warning:focus { outline: var(--border-width-md) solid var(--color-warning); outline-offset: var(--border-width-md); }

.btn-outline-error       { border-color: var(--color-error); color: var(--color-error); }
.btn-outline-error:hover { background-color: var(--color-error); color: var(--color-text-inverse); }
.btn-outline-error:focus { outline: var(--border-width-md) solid var(--color-error); outline-offset: var(--border-width-md); }

Rationale

Exhibiting components directly alongside their underlying variables allows structural integration tools to trace user-interaction paths cleanly. Normalizing form-controls with standard padding targets (var(--spacing-sm)) and keeping button heights consistent across border widths guarantees high visual polish and cohesive alignment.

Key Architectural Decisions

To conclude, the design methodology of the quell-light.css layout system is summarized in these core structural choices:

• Mobile-First Layout Dominance: Desktop layouts are treated as progressive overrides. By declaring 100% full-width column stacking as the mobile baseline and placing multi-column settings inside an isolated @media (min-width: 768px) media query block, Quell Light guarantees instant mobile painting and complete layout stability across small devices.
• Defensive Structural Defaults: Every element normalization rule is designed defensively to protect downstream content formatting. Default list clearings, normalized margins (margin-bottom: var(--spacing-md) on paragraph blocks), and custom anchor focus shadows are deployed universally to establish structured layout defaults.
• Typographic Contrast with Zero Asset Weight: Eliminating physical @font-face network calls ensures a lightweight CSS footprint and immediate rendering. Setting fluid heading sizes via CSS clamp() enables zoom-safe typographic contrast across different viewports, maintaining a beautiful editorial layout without requiring asset-generation pipelines or heavy font layers.
• Clean System Parity with quell-light.js: Component styles (such as the drop-down behavior of .navbar-nav and toggle action of .nav-toggle) map directly to states managed by quell-light.js (using selectors under .is-open). This strict alignment ensures seamless handoffs between CSS states and JavaScript interactions, eliminating visual bugs and visual stutter.

© 2026 Ortiz Design Studio. | quell system documentation.