/* ================================================================================
   STYLESHEET: base.css
   CREATED:    2026-03-15
   MODIFIED:   2026-03-15
   PURPOSE:    CSS variables, reset, and page container layout
   ================================================================================ */

/* ========== CSS VARIABLES ========== */
:root {
    /* Theme */
    --accent-color: #6B8190;
    --bg-color: #fafafa;

    /* 2026-03-08 - App-wide side padding: keeps icons/content aligned across pages */
    /* 2026-03-15 - Responsive side padding: scales with viewport, floors at 32px for narrow windows */
    --app-padding: clamp(32px, 5vw, 140px);

    /* Gallery Grid */
    --card-min-width: 240px;
    --card-gap: 32px;
    --card-radius: 5px;
    --card-shadow: 0 3px 10px rgba(0, 0, 0, 0.1);
    --card-hover-shadow: 0 4px 13px rgba(0, 0, 0, 0.16);
    --card-title-size: 13px;

    /* Topbar */
    /* 2026-03-06 - Updated to match 44px pill + 14px*2 padding */
    --topbar-height: 72px;
    --topbar-bg: #ffffff;
    --topbar-border: #e5e5e5;
    --input-bg: #f0f0f0;
    --input-border: #ddd;
    --input-focus-border: #6B8190;

    /* Typography */
    /* 2026-03-08 - Inter from Google Fonts, system fallbacks */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-serif: 'Libre Baskerville', Georgia, 'Times New Roman', serif;
    --text-primary: #333333;
    --text-secondary: #666666;
    --text-tertiary: #999999;

    /* 2026-02-26 - Unified separator color (Apple-light) */
    --separator-color: #f0f0f0;

    /* 2026-02-26 - Shared header bar shadow */
    --header-shadow: 0 4px 8px rgba(0, 0, 0, 0.10);

    /* Image Viewer */
    --container-padding: 16px;
    /* 2026-03-07 - Increased from 5px to 12px */
    --img-corner: 4px;
    --img-outline-width: 1px;
    --img-outline-color: #cccccc;
    --img-shadow-color: rgba(0, 0, 0, 0.15);
    --img-shadow-blur: 8px;
    --img-shadow-offset-x: 2px;
    --img-shadow-offset-y: 2px;
    --img-shadow-spread: 1px;

    /* Navigation */
    --nav-button-size: 30px;
    --nav-arrow-size: 14px;
    --nav-arrow-margin: 12px;
    --nav-button-bg: rgba(255, 255, 255, 0.9);
    --nav-button-bg-hover: #ffffff;
    --nav-arrow-color: #262626;

    /* Dots */
    --dot-size: 8px;
    --dot-gap: 9px;
    --dots-margin: 16px;
    --dot-color: rgba(255, 255, 255, 0.5);
    --dot-color-active: rgba(255, 255, 255, 0.85);
    --dot-color-hover: rgba(255, 255, 255, 0.7);

    /* Loading */
    --spinner-size: 28px;
    --spinner-color: rgba(255, 255, 255, 0.9);
    --spinner-bg-color: rgba(255, 255, 255, 0.25);
    --loading-overlay-bg: rgba(0, 0, 0, 0.2);
}

/* ========== RESET & BASE ========== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
html {
    width: 100%;
    height: 100%;
    /* 2026-03-15 - Removed 960px floor; detail/creator pages go single-column below 940px */
    overflow-x: auto;
    overflow-y: hidden;
}
body {
    width: 100%;
    height: 100%;
    overflow: hidden;
    font-family: var(--font-family);
    background: var(--bg-color);
    color: var(--text-primary);
    -webkit-user-select: none;
    user-select: none;
    /* 2026-03-08 - Block browser swipe-to-navigate in both directions */
    overscroll-behavior-x: none;
}

/* ========== PAGE CONTAINERS ========== */
/* 2026-02-25 - Opacity cross-fade transitions (replaces slide) */
.page-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    bottom: 0;
    /* 2026-03-15 - Removed 960px floor; pages handle their own min-width via responsive rules */
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.25s ease;
}
.page-container.active {
    opacity: 1;
    pointer-events: auto;
}
#page-home    { z-index: 1; }
/* 2026-03-06 - Gallery page scrolls as whole so content passes under sticky topbar (glass effect) */
/* 2026-03-08 - overscroll-behavior-x: none blocks browser swipe-to-navigate */
#page-gallery { z-index: 2; overflow-y: auto; overflow-x: hidden; -webkit-overflow-scrolling: touch; overscroll-behavior-x: none; }
#page-detail  { z-index: 3; }
#page-creator { z-index: 4; }
#page-add     { z-index: 5; }