/* =============================================
   Theme Variables
   ============================================= */
:root {
    --color-primary-deep: #005f73;
    --color-primary-teal: #0a9396;
    --color-primary-light: #94d2bd;
    --color-accent-gold: #e9d8a6;
    --color-accent-yellow: #ee9b00;
    --color-accent-orange: #ca6702;
    --color-accent-burnt: #bb3e03;
    --color-text-dark: #334155;
    --color-text-medium: #475569;
    --color-bg-light: #f0f9ff;
    --color-bg-card: #ffffff;
    --color-bg-visual: #f8fafc;
    --color-border-light: #e2e8f0;
}

/* =============================================
   Base & Typography Styles
   ============================================= */
body {
    font-family: 'Inter', sans-serif;
    background-color: var(--color-bg-light);
    color: var(--color-text-dark);
    line-height: 1.8;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 2rem;
}

header {
    text-align: center;
    margin-bottom: 3rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--color-border-light);
}

header h1 {
    font-size: 3rem;
    font-weight: 900;
    color: var(--color-primary-deep);
}

header p {
    font-size: 1.5rem;
    color: var(--color-primary-teal);
}

a {
    color: var(--color-accent-burnt);
    font-weight: 600;
    text-decoration: underline;
    text-decoration-style: dashed;
}

a:hover {
    text-decoration-style: solid;
}

/* =============================================
   Layout & Card Styles
   ============================================= */
.grid-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.stage-title {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--color-primary-deep);
    margin-top: 3rem;
    margin-bottom: 1.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--color-primary-light);
    width: 100%;
    display: block;
}

.section {
    background-color: var(--color-bg-card);
    border-radius: 0.5rem;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    padding: 2rem;
    border-left: 5px solid var(--color-primary-teal);
    display: flex;
    flex-direction: column;
    margin-bottom: 2rem; /* Added vertical space between sections */
}

.section h2 {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--color-primary-deep);
    margin-bottom: 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.section p, .section ul {
    font-size: 1rem;
    color: var(--color-text-medium);
    flex-grow: 1;
}

.section ul {
    list-style-type: disc;
    padding-left: 1.5rem;
    margin-top: 1rem;
}

.visual {
    text-align: center;
    margin-bottom: 1.5rem;
    padding: 1rem;
    background-color: var(--color-bg-visual);
    border-radius: 0.5rem;
}

.visual img {
    max-width: 100%;
    height: auto;
    border-radius: 0.5rem;
}

/* =============================================
   Interactive Elements (Buttons, Links, Tooltips)
   ============================================= */
.back-link {
    display: inline-block;
    margin-bottom: 2rem;
    font-size: 1.1rem;
    color: var(--color-primary-teal);
    text-decoration: none;
    font-weight: 600;
}

.back-link:hover {
    text-decoration: underline;
}

.presentation-btn {
    display: inline-block;
    background-color: var(--color-accent-gold);
    color: var(--color-accent-orange);
    padding: 0.5rem 1rem;
    border-radius: 0.375rem;
    margin-top: 1rem;
    font-size: 1.1rem;
    font-weight: 600;
    text-decoration: none;
    transition: background-color 0.2s;
}

.presentation-btn:hover {
    background-color: var(--color-accent-yellow);
    text-decoration: none;
}

.expand-btn {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--color-primary-light);
    padding: 0.25rem;
}

.expand-btn:hover {
    color: var(--color-primary-teal);
}

.expand-btn svg {
    width: 1.5rem;
    height: 1.5rem;
}

.concept {
    text-decoration: underline;
    text-decoration-style: dashed;
    cursor: pointer;
    color: var(--color-accent-burnt);
    font-weight: 600;
    position: relative;
}

.concept .tooltip {
    visibility: hidden;
    width: 250px;
    background-color: var(--color-text-dark);
    color: var(--color-bg-card);
    text-align: center;
    border-radius: 0.375rem;
    padding: 0.5rem 1rem;
    position: absolute;
    z-index: 10;
    bottom: 125%;
    left: 50%;
    margin-left: -125px;
    opacity: 0;
    transition: opacity 0.3s;
    font-size: 0.9rem;
    line-height: 1.5;
}

.concept:hover .tooltip {
    visibility: visible;
    opacity: 1;
}

/* =============================================
   Tag Filtering System (for summary.html)
   ============================================= */
.tag-container {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 3.5rem;
    padding: 1.5rem 1rem;
    border-bottom: 1px solid var(--color-border-light);
}

.tag-btn {
    background-color: var(--color-bg-card);
    border: 1px solid var(--color-primary-light);
    color: var(--color-primary-teal);
    padding: 0.75rem 1.5rem;
    border-radius: 9999px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.2s ease-in-out;
}

.tag-btn:hover {
    background-color: var(--color-primary-light);
    color: var(--color-primary-deep);
}

.tag-btn.active {
    background-color: var(--color-primary-teal);
    color: var(--color-bg-card);
    font-weight: 700;
}

.tag-btn#show-all-btn {
    background-color: var(--color-primary-deep);
    color: var(--color-bg-card);
    border-color: var(--color-primary-deep);
}
.tag-btn#show-all-btn:hover {
    background-color: #087f94; /* Slightly lighter deep teal */
}

/* =============================================
   Presentation Mode (Slideshow)
   ============================================= */
#presentation-overlay {
    position: fixed;
    inset: 0;
    background-color: var(--color-primary-deep);
    z-index: 100;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 4rem;
    background-size: contain;
    background-position: center;
    background-repeat: no-repeat;
    transition: opacity 0.3s ease-in-out;
}

.presentation-slide-container {
    background-color: rgba(0, 47, 57, 0.85);
    color: var(--color-bg-card);
    padding: 2.5rem;
    border-radius: 0.5rem;
    max-width: 800px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    backdrop-filter: blur(10px);
    transition: opacity 0.3s ease-in-out;
    border: 1px solid rgba(148, 210, 189, 0.3);
}

#presentation-overlay:not(:hover) .presentation-slide-container,
#presentation-overlay:not(:hover) .presentation-nav {
    opacity: 0;
}

.presentation-slide-container h2 {
    color: var(--color-accent-gold);
    font-size: 2.5rem;
}

.presentation-slide-container p,
.presentation-slide-container ul {
    font-size: 1.2rem;
    color: var(--color-border-light);
}

.presentation-slide-container .visual {
    display: none;
}

.presentation-nav {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background-color: rgba(0, 47, 57, 0.7);
    color: #fff;
    border: none;
    font-size: 2.5rem;
    cursor: pointer;
    padding: 0.5rem 1.5rem;
    border-radius: 0.375rem;
    transition: all 0.3s ease-in-out;
    -webkit-font-smoothing: antialiased;
}

.presentation-nav:hover:not(:disabled) {
    background-color: var(--color-primary-teal);
}

.presentation-nav:disabled {
    opacity: 0.2;
    cursor: not-allowed;
}

#presentation-prev { left: 1rem; }
#presentation-next { right: 1rem; }

#presentation-close {
    top: 1rem;
    right: 1rem;
    transform: none;
    padding: 0.25rem 1rem;
}

/* =============================================
   Utility Classes
   ============================================= */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

.hidden {
    display: none !important;
}