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

:root {
    --primary: #4A90E2;
    --primary-gradient: linear-gradient(135deg, #4A90E2 0%, #50E3C2 100%);
    --bg-gradient: linear-gradient(135deg, #0f2027 0%, #203a43 50%, #2c5364 100%);
    --card-bg: rgba(255, 255, 255, 0.05);
    --card-border: rgba(255, 255, 255, 0.1);
    --text-main: #ffffff;
    --text-muted: #a0aec0;
    --danger: #ff4757;
    --danger-hover: #ff6b81;
    --success: #2ed573;
    --glass-blur: blur(16px);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Inter', "Yu Gothic", Meiryo, "MS PGothic", sans-serif;
    background: var(--bg-gradient);
    background-attachment: fixed;
    color: var(--text-main);
    line-height: 1.6;
    min-height: 100vh;
    padding: 40px 20px;
    overflow-x: hidden;
}

/* Subtle background overlay pattern */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: radial-gradient(rgba(255, 255, 255, 0.05) 1px, transparent 1px);
    background-size: 30px 30px;
    pointer-events: none;
    z-index: -1;
}

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

header {
    text-align: center;
    margin-bottom: 50px;
    animation: fadeInDown 0.8s ease-out;
}

h1 {
    font-size: 3.2rem;
    font-weight: 700;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 15px;
    letter-spacing: -1px;
}

header p {
    color: var(--text-muted);
    font-size: 1.2rem;
}

.slide-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border-radius: 20px;
    padding: 35px;
    margin-bottom: 24px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
    transition: transform 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275), box-shadow 0.3s ease, border-color 0.3s ease;
    animation: slideUp 0.6s ease-out backwards;
}

.slide-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.4);
    border-color: rgba(255, 255, 255, 0.2);
}

.slide-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 25px;
    padding-bottom: 15px;
    border-bottom: 1px solid var(--card-border);
}

.slide-header h3 {
    font-size: 1.6rem;
    font-weight: 600;
    color: #fff;
    display: flex;
    align-items: center;
    gap: 12px;
}

.slide-header h3::before {
    content: '';
    display: inline-block;
    width: 6px;
    height: 28px;
    background: var(--primary-gradient);
    border-radius: 4px;
}

.form-group {
    margin-bottom: 24px;
}

.form-group label {
    display: block;
    margin-bottom: 10px;
    font-weight: 500;
    color: var(--text-muted);
    font-size: 0.95rem;
    letter-spacing: 0.5px;
}

.form-group input[type="text"],
.form-group textarea {
    width: 100%;
    padding: 16px 20px;
    background: rgba(0, 0, 0, 0.25);
    border: 1px solid var(--card-border);
    border-radius: 12px;
    color: #fff;
    font-family: inherit;
    font-size: 1.05rem;
    transition: all 0.3s ease;
}

.form-group input[type="text"]::placeholder,
.form-group textarea::placeholder {
    color: rgba(255, 255, 255, 0.3);
}

.form-group input[type="text"]:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    background: rgba(0, 0, 0, 0.4);
    box-shadow: 0 0 0 4px rgba(74, 144, 226, 0.15);
}

.form-group textarea {
    resize: vertical;
    min-height: 140px;
    line-height: 1.8;
}

.checkbox-group {
    background: rgba(0, 0, 0, 0.2);
    padding: 20px;
    border-radius: 12px;
    border: 1px solid var(--card-border);
    transition: background 0.3s ease;
}

.checkbox-group:hover {
    background: rgba(0, 0, 0, 0.3);
}

.checkbox-group label {
    display: flex;
    align-items: center;
    cursor: pointer;
    margin-bottom: 0;
    color: #fff;
    font-weight: 500;
}

.checkbox-group input[type="checkbox"] {
    appearance: none;
    width: 26px;
    height: 26px;
    border: 2px solid var(--text-muted);
    border-radius: 6px;
    margin-right: 14px;
    position: relative;
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    background: rgba(0, 0, 0, 0.2);
}

.checkbox-group input[type="checkbox"]:checked {
    background: var(--primary-gradient);
    border-color: transparent;
    transform: scale(1.1);
}

.checkbox-group input[type="checkbox"]:checked::after {
    content: '✓';
    position: absolute;
    color: white;
    font-size: 18px;
    font-weight: bold;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.btn {
    padding: 16px 32px;
    border: none;
    border-radius: 12px;
    cursor: pointer;
    font-weight: 600;
    font-size: 1.15rem;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.btn-primary {
    background: var(--primary-gradient);
    color: white;
    width: 100%;
    margin-top: 40px;
    box-shadow: 0 10px 25px rgba(80, 227, 194, 0.2);
    letter-spacing: 1px;
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-3px);
    box-shadow: 0 15px 35px rgba(80, 227, 194, 0.3);
    filter: brightness(1.1);
}

.btn-primary:active:not(:disabled) {
    transform: translateY(0);
}

.btn-primary:disabled {
    opacity: 0.7;
    cursor: not-allowed;
    transform: none;
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.05);
    border: 2px dashed rgba(255, 255, 255, 0.3);
    color: var(--text-main);
    width: 100%;
    margin-bottom: 20px;
}

.btn-secondary:hover {
    border-color: var(--primary);
    color: #fff;
    background: rgba(74, 144, 226, 0.15);
}

.btn-remove-slide {
    background: rgba(255, 71, 87, 0.15);
    color: var(--danger);
    border: 1px solid rgba(255, 71, 87, 0.3);
    padding: 10px 20px;
    border-radius: 8px;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn-remove-slide:hover {
    background: var(--danger);
    color: white;
    transform: scale(1.05);
}

#status-message {
    margin-top: 30px;
    text-align: center;
    font-weight: 600;
    font-size: 1.1rem;
    padding: 20px;
    border-radius: 12px;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    opacity: 0;
    transform: translateY(10px);
    display: none;
}

#status-message.show {
    opacity: 1;
    transform: translateY(0);
    display: block;
}

.error {
    background: rgba(255, 71, 87, 0.15);
    color: #ff6b81;
    border: 1px solid rgba(255, 71, 87, 0.3);
    backdrop-filter: var(--glass-blur);
}

.success {
    background: rgba(46, 213, 115, 0.15);
    color: #2ed573;
    border: 1px solid rgba(46, 213, 115, 0.3);
    backdrop-filter: var(--glass-blur);
}

.loading {
    background: rgba(74, 144, 226, 0.15);
    color: #63b3ed;
    border: 1px solid rgba(74, 144, 226, 0.3);
    backdrop-filter: var(--glass-blur);
}

/* Animations */
@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(40px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Custom scrollbar */
::-webkit-scrollbar {
    width: 10px;
}
::-webkit-scrollbar-track {
    background: var(--bg-gradient);
}
::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.2);
    border-radius: 5px;
}
::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.3);
}