/* Drag & Drop Overlay */
.drop-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(15, 23, 42, 0.9);
    backdrop-filter: blur(10px);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    pointer-events: none;
    flex-direction: column;
    gap: 1.5rem;
    border: 4px dashed var(--accent);
    margin: 1.5rem;
    width: calc(100% - 3rem);
    height: calc(100% - 3rem);
    border-radius: 2rem;
    transition: all 0.3s ease;
}

.drop-overlay.active {
    display: flex;
    pointer-events: auto;
}

.drop-overlay-text {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--accent);
    font-family: var(--font-heading);
    text-shadow: 0 0 20px var(--accent-glow);
}

:root {
    --accent: #6366f1;
    --accent-hover: #4f46e5;
    --accent-glow: rgba(99, 102, 241, 0.3);
    --success: #10b981;
    --error: #ef4444;
    --font-main: 'Inter', sans-serif;
    --font-heading: 'Outfit', sans-serif;
    --glass-blur: blur(12px);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.dark-theme {
    --bg-main: #0f172a;
    --bg-card: rgba(30, 41, 59, 0.7);
    --bg-modal: #1e293b;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --border: rgba(255, 255, 255, 0.1);
    --shadow-lg: 0 10px 25px -5px rgba(0, 0, 0, 0.5);
    --glass-bg: rgba(30, 41, 59, 0.7);
    --input-bg: rgba(255, 255, 255, 0.05);
}

.light-theme {
    --bg-main: #f8fafc;
    --bg-card: rgba(255, 255, 255, 0.8);
    --bg-modal: #ffffff;
    --text-main: #0f172a;
    --text-muted: #64748b;
    --border: rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 10px 25px -5px rgba(0, 0, 0, 0.08);
    --glass-bg: rgba(255, 255, 255, 0.8);
    --input-bg: rgba(0, 0, 0, 0.03);
}

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

body {
    font-family: var(--font-main);
    background-color: var(--bg-main);
    color: var(--text-main);
    line-height: 1.6;
    overflow-x: hidden;
    min-height: 100vh;
}

/* Scrollbar styles */
::-webkit-scrollbar {
    width: 6px;
}
::-webkit-scrollbar-track {
    background: var(--bg-main);
}
::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 10px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

.app-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 2rem;
    height: 100vh;
    display: flex;
    flex-direction: column;
    animation: fadeIn 0.8s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes cardEntry {
    from { opacity: 0; transform: scale(0.95); }
    to { opacity: 1; transform: scale(1); }
}

/* Header Styles */
.main-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo-icon {
    color: var(--accent);
    width: 32px;
    height: 32px;
    filter: drop-shadow(0 0 8px var(--accent-glow));
}

.logo-text {
    font-family: var(--font-heading);
    font-size: 1.75rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.main-nav {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.nav-btn {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-muted);
    padding: 0.6rem 1rem;
    border-radius: 0.75rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: all 0.2s ease;
    font-weight: 500;
}

.nav-btn:hover {
    border-color: var(--accent);
    color: var(--text-main);
    background: rgba(99, 102, 241, 0.05);
}

.nav-btn.primary {
    background: var(--accent);
    border-color: var(--accent);
    color: white;
    padding-left: 1.25rem;
    padding-right: 1.25rem;
    box-shadow: 0 4px 14px 0 var(--accent-glow);
}

.nav-btn.primary:hover {
    background: var(--accent-hover);
    transform: translateY(-2px);
}

.nav-btn.active {
    background: var(--border);
    color: var(--text-main);
}

.nav-divider {
    width: 1px;
    height: 24px;
    background: var(--border);
    margin: 0 0.5rem;
}

/* Main Layout Wrapper */
.main-wrapper {
    display: flex;
    flex: 1;
    overflow: hidden;
    gap: 1.5rem;
    margin-top: 2rem;
}

/* Sidebar Styling */
.sidebar {
    width: 300px;
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    background: var(--bg-card);
    backdrop-filter: var(--glass-blur);
    border: 1px solid var(--border);
    border-radius: 1.5rem;
    overflow-y: auto;
    padding: 1.5rem;
}

.sidebar-header {
    margin-bottom: 1.5rem;
}

.sidebar-header h3 {
    font-family: var(--font-heading);
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-muted);
}

.project-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.project-item {
    padding: 1rem;
    border-radius: 1rem;
    cursor: pointer;
    transition: all 0.2s ease;
    border: 1px solid transparent;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.project-item:hover {
    background: rgba(255, 255, 255, 0.03);
    border-color: var(--border);
}

.project-item.active {
    background: rgba(99, 102, 241, 0.15);
    border-color: var(--accent);
    box-shadow: 0 4px 15px 0 rgba(99, 102, 241, 0.2);
}

.project-item-name {
    font-weight: 700;
    font-size: 1rem;
    color: var(--text-main);
}

.project-item-meta {
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* Main Content Area */
.content-area {
    flex: 1;
    overflow-y: auto;
    padding-right: 0.5rem;
}

/* Plan Card is no longer used for landing, but kept if needed for other structures */
.plan-card {
    background: var(--bg-card);
    backdrop-filter: var(--glass-blur);
    border: 1px solid var(--border);
    border-radius: 1.25rem;
    padding: 1.5rem;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
    animation: cardEntry 0.5s ease-out backwards;
}

.plan-card::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, transparent 0%, rgba(99, 102, 241, 0.03) 100%);
    pointer-events: none;
}

.plan-card:hover {
    transform: translateY(-8px);
    border-color: var(--accent);
    box-shadow: var(--shadow-lg);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 1.25rem;
}

.card-title {
    font-family: var(--font-heading);
    font-size: 1.35rem;
    font-weight: 600;
    color: var(--text-main);
}

.card-tag {
    font-size: 0.75rem;
    padding: 0.25rem 0.6rem;
    border-radius: 2rem;
    background: rgba(99, 102, 241, 0.1);
    color: var(--accent);
    font-weight: 600;
    border: 1px solid rgba(99, 102, 241, 0.2);
}

.card-desc {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 1.5rem;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    line-clamp: 2; /* Standard property for cross-browser support */
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* Progress Bar */
.progress-container {
    margin-top: 1rem;
}

.progress-label {
    display: flex;
    justify-content: space-between;
    font-size: 0.85rem;
    margin-bottom: 0.5rem;
}

.progress-track {
    height: 6px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 3px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--accent), #818cf8);
    transition: width 0.8s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 0 10px var(--accent-glow);
}

/* Empty State */
.empty-state {
    grid-column: 1 / -1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 5rem 2rem;
    color: var(--text-muted);
    text-align: center;
}

.empty-icon {
    width: 64px;
    height: 64px;
    margin-bottom: 1.5rem;
    opacity: 0.3;
}

/* Modal Overlay */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    pointer-events: none;
    transition: all 0.3s ease;
}

.modal-overlay:not(.hidden) {
    opacity: 1;
    pointer-events: auto;
}

.modal {
    background: var(--bg-modal);
    width: 100%;
    max-width: 500px;
    border-radius: 1.5rem;
    padding: 2rem;
    border: 1px solid var(--border);
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    transform: scale(0.9);
    transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.modal-overlay:not(.hidden) .modal {
    transform: scale(1);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.close-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 0.5rem;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--text-main);
    font-size: 0.9rem;
}

input[type="text"], textarea {
    width: 100%;
    background: var(--input-bg);
    border: 1px solid var(--border);
    padding: 0.75rem 1rem;
    border-radius: 0.75rem;
    color: var(--text-main);
    font-family: inherit;
    transition: all 0.2s ease;
}

input:focus, textarea:focus {
    outline: none;
    border-color: var(--accent);
    background: rgba(255, 255, 255, 0.08);
}

.submit-btn {
    width: 100%;
    padding: 1rem;
    background: var(--accent);
    color: white;
    border: none;
    border-radius: 0.75rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.2s;
}

.submit-btn:hover {
    background: var(--accent-hover);
    transform: translateY(-2px);
}

/* Utilities */
.hidden {
    display: none !important;
}

/* Detail View Custom styles */
.back-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    margin-bottom: 2rem;
    transition: color 0.2s;
}

.back-btn:hover {
    color: var(--text-main);
}

/* Detail View Content */
.detail-main {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 3rem;
}

.plan-title-area h2 {
    font-family: var(--font-heading);
    font-size: 2.75rem;
    margin-bottom: 1rem;
}

.plan-info-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    margin-top: 2rem;
}

.info-card {
    background: var(--bg-card);
    padding: 1.5rem;
    border-radius: 1rem;
    border: 1px solid var(--border);
}

/* Flow Styles */
.flow-container {
    margin-top: 3rem;
}

.flow-step {
    display: flex;
    gap: 1.5rem;
    position: relative;
    padding-bottom: 2.5rem;
}

.flow-step:last-child {
    padding-bottom: 0;
}

.flow-step::before {
    content: '';
    position: absolute;
    left: 11px;
    top: 24px;
    width: 2px;
    height: calc(100% - 24px);
    background: var(--border);
}

.flow-step:last-child::before {
    display: none;
}

.flow-step.complete::before {
    background: var(--success);
}

.step-indicator {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--bg-main);
    border: 2px solid var(--border);
    flex-shrink: 0;
    z-index: 1;
    display: flex;
    align-items: center;
    justify-content: center;
}

.flow-step.complete .step-indicator {
    border-color: var(--success);
    background: var(--success);
    color: white;
}

.flow-step.current .step-indicator {
    border-color: var(--accent);
    box-shadow: 0 0 10px var(--accent-glow);
}

.step-content {
    flex-grow: 1;
}

.step-content h4 {
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.step-content p {
    font-size: 0.9rem;
    color: var(--text-muted);
}

/* Memo Styles in Flow */
.step-memo-container {
    margin-top: 1rem;
    margin-bottom: 1rem;
}

.memo-label {
    display: block;
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    margin-bottom: 0.4rem;
    font-weight: 700;
}

.step-memo {
    width: 100%;
    min-height: 80px;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border);
    border-radius: 0.75rem;
    color: var(--text-main);
    padding: 0.75rem;
    font-size: 0.85rem;
    font-family: inherit;
    resize: vertical;
    transition: all 0.2s ease;
}

.step-memo:focus {
    outline: none;
    border-color: var(--accent);
    background: rgba(255, 255, 255, 0.06);
    box-shadow: 0 0 10px var(--accent-glow);
}

.step-memo::placeholder {
    color: rgba(148, 163, 184, 0.4);
}

.step-toggle {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-muted);
    padding: 0.4rem 0.8rem;
    border-radius: 0.5rem;
    font-size: 0.75rem;
    cursor: pointer;
    margin-top: 0.75rem;
    transition: all 0.2s;
}

.step-toggle:hover {
    border-color: var(--text-main);
}

.step-toggle.active {
    background: var(--success);
    color: white;
    border-color: var(--success);
}

/* Responsive */
@media (max-width: 1024px) {
    .sidebar {
        width: 240px;
    }
}

@media (max-width: 768px) {
    .main-wrapper {
        flex-direction: column;
        overflow-y: auto;
    }

    .sidebar {
        width: 100%;
        max-height: 200px;
    }

    .detail-main {
        grid-template-columns: 1fr;
    }

    .app-container {
        padding: 1rem;
        height: auto;
        min-height: 100vh;
    }
}

.card-desc {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 1.5rem;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    line-clamp: 2; /* Standard property for cross-browser support */
    -webkit-box-orient: vertical;
    overflow: hidden;
}