@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@400;500;600;700&display=swap');

:root {
    --primary-color: #6a11cb;
    --secondary-color: #2575fc;
    --background-color: #f0f2f5;
    --surface-color: #ffffff;
    --text-color: #333;
    --text-color-light: #fff;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --glow-color: rgba(37, 117, 252, 0.5);
    --border-color: #eee;
}

body.dark-mode {
    --primary-color: #8a3ffc;
    --secondary-color: #3391ff;
    --background-color: #161616;
    --surface-color: #242424;
    --text-color: #f4f4f4;
    --text-color-light: #161616;
    --shadow-color: rgba(0, 0, 0, 0.3);
    --glow-color: rgba(51, 145, 255, 0.5);
    --border-color: #333;
}

/* General Styles & Background Texture */
body {
    font-family: 'Poppins', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    margin: 0;
    padding: 20px;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    min-height: 100vh;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='4' height='4' viewBox='0 0 4 4'%3E%3Cpath fill='%239C92AC' fill-opacity='0.1' d='M1 3h1v1H1V3zm2-2h1v1H3V1z'%3E%3C/path%3E%3C/svg%3E");
    transition: background-color 0.3s ease, color 0.3s ease;
}

body.dark-mode {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='4' height='4' viewBox='0 0 4 4'%3E%3Cpath fill='%23E0E0E0' fill-opacity='0.05' d='M1 3h1v1H1V3zm2-2h1v1H3V1z'%3E%3C/path%3E%3C/svg%3E");
}

#app {
    width: 100%;
    max-width: 1200px;
    background-color: var(--surface-color);
    border-radius: 20px;
    box-shadow: 0 10px 30px var(--shadow-color);
    padding: 30px;
    transition: background-color 0.3s ease;
}

header {
    position: relative; /* Ensure children absolute positioning is relative to header */
    text-align: center;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 20px;
    margin-bottom: 30px;
    transition: border-color 0.3s ease;
}

h1 {
    font-weight: 700;
    font-size: 2.5em;
    background: linear-gradient(45deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* Theme Toggle Button */
#theme-toggle {
    position: absolute;
    top: 10px; /* Adjusted */
    right: 10px; /* Adjusted */
    background: none;
    border: 1px solid var(--border-color);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: background-color 0.3s, border-color 0.3s;
}
#theme-toggle svg {
    width: 20px;
    height: 20px;
    fill: var(--primary-color);
}
#theme-toggle:hover {
    background-color: rgba(106, 17, 203, 0.1);
}
body.dark-mode #theme-toggle .sun-icon { display: block; }
body.dark-mode #theme-toggle .moon-icon { display: none; }
body:not(.dark-mode) #theme-toggle .sun-icon { display: none; }
body:not(.dark-mode) #theme-toggle .moon-icon { display: block; }


/* Common Navigation */
.main-nav {
    display: none; /* Hidden by default, shown on desktop */
}
.main-nav a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 600;
    padding: 8px 15px;
    border-radius: 8px;
    transition: background-color 0.3s, color 0.3s;
}
.main-nav a:hover, .main-nav a.active {
    background-color: var(--primary-color);
    color: var(--text-color-light);
}
body.dark-mode .main-nav a.active {
    color: #fff;
}

/* Hamburger Menu & Mobile Nav */
.hamburger-btn {
    display: block;
    position: absolute;
    top: 30px;
    right: 30px;
    z-index: 1001;
    background: none;
    border: none;
    cursor: pointer;
}
.hamburger-btn .line {
    width: 30px;
    height: 3px;
    background-color: var(--primary-color);
    margin: 6px 0;
    transition: all 0.3s ease;
}

.mobile-nav {
    position: fixed;
    top: 0;
    left: 100%;
    width: 100%;
    height: 100%;
    background: var(--surface-color);
    z-index: 1000;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 20px;
    transition: left 0.4s cubic-bezier(0.77, 0, 0.175, 1);
}
.mobile-nav a {
    text-decoration: none;
    color: var(--text-color);
    font-size: 2em;
    font-weight: 600;
    padding: 10px 20px;
    border-radius: 8px;
}
.mobile-nav a.active {
    background-color: var(--primary-color);
    color: #fff;
}

/* Nav Open State */
.nav-open .mobile-nav {
    left: 0;
}
.nav-open .hamburger-btn .line-1 {
    transform: rotate(-45deg) translate(-7px, 7px);
}
.nav-open .hamburger-btn .line-2 {
    opacity: 0;
}
.nav-open .hamburger-btn .line-3 {
    transform: rotate(45deg) translate(-7px, -7px);
}


/* Common Content Wrapper */
.content-wrapper {
    padding: 10px;
    max-width: 800px;
    margin: 0 auto;
}
.content-wrapper h2 {
    font-size: 1.8em;
    color: var(--primary-color);
    border-bottom: 2px solid var(--secondary-color);
    padding-bottom: 10px;
    margin-bottom: 20px;
}
.content-wrapper p {
    line-height: 1.7;
    margin-bottom: 15px;
}

/* AdSense Placeholder */
.ad-placeholder {
    display: block; /* Hide the ad placeholder as requested */
    width: 100%;
    max-width: 728px;
    min-height: 90px;
    background-color: var(--background-color);
    border: 1px dashed #555;
    margin: 0 auto 30px auto;
    justify-content: center;
    align-items: center;
    color: #888;
    font-weight: 500;
    border-radius: 8px;
    transition: background-color 0.3s;
}

.controls {
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px;
}

/* Responsive Overrides */
@media (min-width: 769px) {
    #app {
        padding: 40px;
    }
    .hamburger-btn {
        display: none;
    }
    .main-nav {
        display: flex;
        justify-content: center;
        padding: 15px 0;
        margin-bottom: 30px;
        background-color: var(--surface-color);
        border-bottom: 1px solid var(--border-color);
        transition: background-color 0.3s, border-color 0.3s;
    }
    .content-wrapper {
        padding: 20px;
    }
    .controls {
        grid-template-columns: 1fr 1fr;
        align-items: start;
        gap: 30px;
    }
    .name-input-group {
        grid-column: 1 / 2;
    }
    #name-list-container {
        grid-column: 1 / 2;
        grid-row: 2 / 3;
    }
    #assign {
        align-self: end;
    }
}

@media (max-width: 768px) {
    body {
        padding: 0;
    }
    #app {
        border-radius: 0;
        padding: 15px;
    }
    header {
        padding: 15px; /* 헤더 패딩을 기본으로 되돌립니다 */
        position: relative; /* 상대 위치 지정 */
        margin-bottom: 20px;
        text-align: center;
    }
    h1 {
        font-size: 1.6em;
        margin: 0 auto; /* 중앙 정렬 */
        max-width: calc(100% - 120px); /* 버튼과 겹치지 않도록 너비 제한 */
    }
    header p {
        font-size: 0.8em;
        margin: 0 auto; /* 중앙 정렬 */
        max-width: calc(100% - 120px); /* 버튼과 겹치지 않도록 너비 제한 */
    }
    #theme-toggle {
        top: 40px; /* Moved higher, directly below hamburger */
        right: 5px; /* Moved further right */
    }
    .hamburger-btn {
        top: 10px; /* Stays the same */
        right: 15px; /* Stays the same */
    }
}

.control-group {
    display: flex;
    flex-direction: column;
}

label {
    margin-bottom: 10px;
    font-weight: 600;
    color: #555;
}

/* Name Input */
.name-input-wrapper {
    display: flex;
    gap: 8px;
}

input[type="text"], select {
    width: 100%;
    padding: 10px 15px;
    border: 1px solid #ccc;
    border-radius: 8px;
    font-size: 16px;
    box-sizing: border-box;
    height: 48px;
    transition: border-color 0.3s, box-shadow 0.3s;
}

input[type="text"]:focus, select:focus {
    outline: none;
    border-color: var(--secondary-color);
    box-shadow: 0 0 0 3px var(--glow-color);
}

#add-name-btn {
    padding: 0 25px;
    background: linear-gradient(45deg, var(--primary-color), var(--secondary-color));
    color: var(--text-color-light);
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    flex-shrink: 0;
    transition: transform 0.2s, box-shadow 0.3s;
}

#add-name-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px var(--glow-color);
}

/* Name List */
#name-list {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    padding: 10px;
    background-color: #f8f9f9;
    border-radius: 8px;
    min-height: 40px;
}
body.dark-mode #name-list {
    background-color: #333;
}

.name-tag {
    display: flex;
    align-items: center;
    gap: 8px;
    background: var(--secondary-color);
    color: var(--text-color-light);
    padding: 8px 12px;
    border-radius: 6px;
    font-size: 15px;
    font-weight: 500;
}

.remove-tag-btn {
    background: none;
    border: none;
    color: var(--text-color-light);
    font-size: 20px;
    cursor: pointer;
    padding: 0;
    line-height: 1;
    opacity: 0.7;
    transition: opacity 0.2s;
}
.remove-tag-btn:hover {
    opacity: 1;
}

/* Contact Form Styles */
.contact-form {
    display: flex !important; /* Keep flex for internal layout */
    flex-direction: column !important;
    gap: 20px !important;
    padding: 20px !important;
    background-color: var(--surface-color) !important;
    border-radius: 12px !important;
    box-shadow: 0 5px 15px var(--shadow-color) !important;
    margin: 0 auto !important; /* Force center */
    max-width: 800px !important; /* Match content-wrapper max-width for full width within container */
    width: 100% !important; /* Ensure it takes full width within max-width */
}
.contact-form .form-group {
    display: flex;
    flex-direction: column;
}
.contact-form label {
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--text-color);
}
.contact-form input[type="text"],
.contact-form input[type="email"],
.contact-form textarea {
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 16px;
    background-color: var(--background-color);
    color: var(--text-color);
    transition: border-color 0.3s, box-shadow 0.3s;
    width: 100%;
    box-sizing: border-box; /* Ensures padding doesn't increase total width */
}
.contact-form input[type="text"]:focus,
.contact-form input[type="email"]:focus,
.contact-form textarea:focus {
    outline: none;
    border-color: var(--secondary-color);
    box-shadow: 0 0 0 3px var(--glow-color);
}
.contact-form textarea {
    resize: vertical;
    min-height: 100px;
}
.contact-form .submit-btn {
    padding: 15px 20px;
    background: linear-gradient(45deg, #fe8c00, #f83600);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 18px;
    font-weight: 700;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.3s;
    width: 100%;
    box-sizing: border-box;
}
.contact-form .submit-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(254, 140, 0, 0.4);
}


/* Assign Button */
#assign {
    padding: 15px 20px;
    background: linear-gradient(45deg, #fe8c00, #f83600);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 18px;
    font-weight: 700;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.3s;
    width: 100%;
    height: auto;
}
#assign:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(254, 140, 0, 0.4);
}

.name-tag {
    display: flex;
    align-items: center;
    gap: 8px;
    background: var(--secondary-color);
    color: var(--text-color-light);
    padding: 8px 12px;
    border-radius: 6px;
    font-size: 15px;
    font-weight: 500;
}

.remove-tag-btn {
    background: none;
    border: none;
    color: var(--text-color-light);
    font-size: 20px;
    cursor: pointer;
    padding: 0;
    line-height: 1;
    opacity: 0.7;
    transition: opacity 0.2s;
}
.remove-tag-btn:hover {
    opacity: 1;
}

/* Assign Button */
#assign {
    padding: 15px 20px;
    background: linear-gradient(45deg, #fe8c00, #f83600);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 18px;
    font-weight: 700;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.3s;
    width: 100%;
    height: auto;
}
#assign:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(254, 140, 0, 0.4);
}


/* Seating Chart */
.seating-chart {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 40px;
    padding: 20px;
    background-color: transparent;
    border-radius: 8px;
    margin-top: 20px;
    min-height: 300px;
}

.table-group {
    display: flex;
    flex-direction: column;
    align-items: center;
    flex-basis: 360px; /* Give a base width to prevent too much shrinking */
    flex-shrink: 0; /* Prevent shrinking */
}

.group-title {
    font-size: 1.5em;
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 20px;
}

.grid-layout, .circle-layout {
    padding: 10px;
}

.grid-layout {
    display: grid;
    grid-template-columns: repeat(var(--cols, 4), 1fr);
    gap: 20px;
}

.circle-layout {
    position: relative;
    width: 100%; /* Use full width of parent */
    max-width: 350px;
    aspect-ratio: 1 / 1;
    margin: 20px auto;
    /* Define a responsive radius using fixed values that change with screen size */
    --radius: 110px;
}
@media (min-width: 400px) {
    .circle-layout { --radius: 140px; }
}

.seat {
    background-color: var(--surface-color);
    border: 1px solid #e0e0e0;
    border-radius: 12px;
    text-align: center;
    font-weight: 600;
    box-shadow: 0 5px 15px var(--shadow-color);
    transition: opacity 0.4s ease-out, transform 0.4s ease-out, box-shadow 0.3s ease-in-out;
    word-break: break-word;
    min-height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 10px;
    
    /* Animation properties */
    opacity: 0;
    transform: translateY(20px);
}
.seat.visible {
    opacity: 1;
    transform: translateY(0);
}

.seat:hover {
    transform: translateY(-5px) scale(1.03);
    box-shadow: 0 8px 25px var(--shadow-color);
}
.seat.unassigned {
    background-color: #f9f9f9;
    color: #aaa;
    box-shadow: 0 2px 5px var(--shadow-color);
}


.circle-layout .seat {
    position: absolute;
    top: 50%;
    left: 50%;
    --angle: calc(360deg / var(--total-seats) * var(--seat-index));
    /* Set initial transform for circle seats, using the container-relative radius */
    transform: translate(-50%, -50%) rotate(var(--angle)) translateY(calc(-1 * var(--radius) + 20px)) rotate(calc(-1 * var(--angle)));
    margin: 0;
    width: 60px; /* Reduced width to prevent overlap and increase spacing */
    height: 60px; /* Match width for a circle */
}
/* Final state for visible circle seats */
.circle-layout .seat.visible {
    transform: translate(-50%, -50%) rotate(var(--angle)) translateY(calc(-1 * var(--radius))) rotate(calc(-1 * var(--angle)));
}

.circle-layout .seat:hover {
    /* visible class is needed to apply the correct base transform */
    transform: translate(-50%, -50%) rotate(var(--angle)) translateY(calc(-1 * var(--radius) - 5px)) rotate(calc(-1 * var(--angle))) scale(1.05);
}