:root {
    /* Base Variables (Will be updated by JS) */
    --bg-color: #0f172a;
    --text-color: #e2e8f0;
    --accent-color: #38bdf8;
    --heading-font: 'Playfair Display', serif;
    --body-font: 'Inter', sans-serif;
    --card-bg: rgba(255, 255, 255, 0.05);

    /* Layout */
    --max-width: 1200px;
    --header-height: 60px;
}

* {
    box-sizing: border-box;
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: var(--body-font);
    margin: 0;
    transition: background-color 0.8s cubic-bezier(0.2, 0.8, 0.2, 1),
        color 0.8s cubic-bezier(0.2, 0.8, 0.2, 1);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
    line-height: 1.6;
}

#app {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 8rem 2rem 4rem;
    display: grid;
    gap: 4rem;
    align-items: center;
    min-height: 100vh;
    /* Default: Split */
    grid-template-columns: 1fr 1fr;
    transition: all 0.5s ease-in-out;
}

/* Layout Variations */

/* 1. Reversed: Experience Left, Profile Right */
#app[data-layout="reversed"] {
    grid-template-columns: 1fr 1fr;
}

#app[data-layout="reversed"] header {
    order: 2;
    text-align: right;
}

#app[data-layout="reversed"] #experience-list {
    order: 1;
}

/* 2. Stacked: Center Everything vertically */
#app[data-layout="stacked"] {
    grid-template-columns: 1fr;
    max-width: 800px;
    text-align: center;
}

#app[data-layout="stacked"] header {
    text-align: center;
    margin-bottom: 2rem;
}

#app[data-layout="stacked"] #experience-list {
    align-items: center;
    /* Center flex items */
}

#app[data-layout="stacked"] .experience-item {
    border-left: none;
    border-top: 2px solid rgba(255, 255, 255, 0.1);
    padding-left: 0;
    padding-top: 1.5rem;
    text-align: center;
}

/* 3. Hero: Large Profile Top, Experience Bottom */
#app[data-layout="hero"] {
    grid-template-columns: 1fr;
    gap: 4rem;
}

#app[data-layout="hero"] header h1 {
    font-size: clamp(5rem, 15vw, 10rem);
    line-height: 0.9;
}

#app[data-layout="hero"] #experience-list {
    max-width: 800px;
    margin: 0 auto;
    width: 100%;
}

/* Typography */
header {
    text-align: left;
}

h1 {
    font-family: var(--heading-font);
    font-size: clamp(3rem, 8vw, 6rem);
    font-weight: 400;
    line-height: 1.1;
    margin: 0 0 2rem 0;
    color: var(--text-color);
    letter-spacing: -0.02em;
}

h1 i {
    font-style: italic;
    color: var(--accent-color);
}

#description {
    font-size: 1.25rem;
    margin-bottom: 3rem;
    opacity: 0.8;
    font-weight: 300;
}

#social-links {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

#linkedin,
#github {
    display: inline-block;
    padding: 0.8rem 1.5rem;
    border: 1px solid var(--accent-color);
    color: var(--accent-color);
    text-transform: uppercase;
    letter-spacing: 1px;
    font-size: 0.8rem;
    transition: all 0.3s ease;
    text-decoration: none;
}

#linkedin:hover,
#github:hover {
    background: var(--accent-color);
    color: var(--bg-color);
}

/* Experience Section */
#experience-list {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.experience-item {
    border-left: 2px solid rgba(255, 255, 255, 0.1);
    padding-left: 2rem;
    transition: border-color 0.3s ease;
}

.experience-item:hover {
    border-color: var(--accent-color);
}

.exp-header {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
}

.exp-role {
    font-weight: 600;
    color: var(--text-color);
}

.exp-company {
    color: var(--accent-color);
    font-family: var(--heading-font);
    font-style: italic;
}

.exp-period {
    font-size: 0.85rem;
    opacity: 0.6;
    margin-bottom: 1rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.exp-desc {
    margin: 0;
    font-size: 1rem;
    opacity: 0.8;
    max-width: 60ch;
}

/* Calendar Toggle Button */
#calendar-toggle-btn {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    background: #111827;
    color: #ffffff;
    border: none;
    padding: 0.8rem 1.5rem;
    border-radius: 9999px;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-family: var(--body-font);
    font-size: 0.9rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    cursor: pointer;
    z-index: 1010;
    transition: all 0.3s ease;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
}

#calendar-toggle-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

/* Calendar Popover (No Overlay) */
#calendar-overlay {
    position: fixed;
    bottom: 5rem;
    /* Above button */
    right: 2rem;
    width: auto;
    height: auto;
    background: transparent;
    pointer-events: none;
    /* Default hidden state */
    z-index: 1000;
    display: flex;
    justify-content: flex-end;
}

#calendar-overlay.hidden #calendar-container {
    opacity: 0;
    transform: translateY(20px) scale(0.95);
    pointer-events: none;
}

#calendar-container {
    background-color: #ffffff;
    /* Always white per request */
    color: #111827;
    /* Force dark text */
    padding: 1.5rem;
    border-radius: 12px;
    width: 320px;
    /* Popover Transition */
    opacity: 1;
    transform: translateY(0) scale(1);
    transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
    pointer-events: auto;
    box-shadow:
        0 4px 6px -1px rgba(0, 0, 0, 0.1),
        0 2px 4px -1px rgba(0, 0, 0, 0.06),
        0 20px 25px -5px rgba(0, 0, 0, 0.1),
        0 10px 10px -5px rgba(0, 0, 0, 0.04);
    border: 1px solid rgba(0, 0, 0, 0.1);
}

.calendar-header-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
    padding-bottom: 0.5rem;
}

#calendar-container h2 {
    font-family: var(--heading-font);
    /* Use variable font but forced color */
    font-size: 1.25rem;
    margin: 0;
    font-weight: 700;
    color: #111827;
}

#close-calendar {
    font-size: 1.5rem;
    line-height: 1;
    padding: 0;
    color: #9ca3af;
    background: transparent;
}

#close-calendar:hover {
    color: #111827;
}

#calendar-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    font-family: var(--body-font);
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    color: #4b5563;
}

button {
    background: none;
    border: none;
    color: var(--text-color);
    cursor: pointer;
    font-size: 1.2rem;
    padding: 0.5rem;
    transition: color 0.2s;
}

button:hover {
    color: var(--accent-color);
}

#calendar-controls button {
    color: #111827;
    border: 1px solid #e5e7eb;
    border-radius: 4px;
    padding: 0.2rem 0.6rem;
    font-size: 1rem;
}

#calendar-controls button:hover {
    background: #f3f4f6;
}

#calendar-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 4px;
    text-align: center;
}

.calendar-day {
    aspect-ratio: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    border-radius: 6px;
    font-size: 0.85rem;
    transition: all 0.15s ease;
    color: #374151;
    border: none;
}

.calendar-day:hover:not(.empty) {
    background-color: #f3f4f6;
    font-weight: 600;
}

.calendar-day.active {
    background-color: #111827;
    /* Dark active state */
    color: #ffffff;
    font-weight: bold;
}

.calendar-day.empty {
    cursor: default;
    opacity: 0;
}

footer {
    position: fixed;
    bottom: 2rem;
    left: 2rem;
    font-size: 0.8rem;
    opacity: 0.5;
    text-align: left;
    pointer-events: none;
}

footer a {
    color: inherit;
    pointer-events: auto;
    text-decoration: underline;
    text-underline-offset: 2px;
}

/* Mobile Responsive */
@media (max-width: 768px) {
    #app {
        grid-template-columns: 1fr;
        padding-top: 6rem;
        gap: 3rem;
    }

    h1 {
        font-size: 3.5rem;
    }

    footer {
        position: relative;
        bottom: auto;
        right: auto;
        text-align: center;
        margin-top: 2rem;
    }
}