/* ========================================================================== Tsuroya entry gate: the "Impact Constellation" intro screen. Loaded by index.php only. Every rule below is scoped to html.is-intro, a class the inline script in index.php's adds before first paint. Without JS the class is never added and this file is inert. ========================================================================== */ :root { /* Above the mission dock and WhatsApp FAB (1000), below the success modal (9999). */ --z-intro: 2000; } .intro-gate { display: none; } html.is-intro, html.is-intro body { overflow: hidden; overscroll-behavior: none; } html.is-intro body { height: 100%; } html.is-intro .intro-gate { position: fixed; z-index: var(--z-intro); inset: 0; display: flex; align-items: center; justify-content: center; overflow: hidden; cursor: pointer; touch-action: none; overscroll-behavior: none; /* Byte for byte the .hero base gradient, so the handoff shifts no colour. */ background: linear-gradient(135deg, #020a1d 0%, var(--navy-950) 36%, #082966 100%); } /* -------------------------------------------------------------------------- Layers: nebula, then stars, then bloom, then the lockup. Absolute layers are painted in DOM order, so the lockup needs no z-index. -------------------------------------------------------------------------- */ .intro-gate-nebula { position: absolute; inset: -20%; background: radial-gradient(closest-side, rgba(255, 195, 34, 0.13), transparent 70%) 62% 38% / 52vmax 52vmax no-repeat, radial-gradient(closest-side, rgba(21, 92, 245, 0.16), transparent 70%) 30% 68% / 64vmax 64vmax no-repeat; filter: blur(6px); pointer-events: none; will-change: transform; animation: introDrift 44s ease-in-out infinite alternate; } @keyframes introDrift { from { transform: translate3d(-1.5%, 1%, 0) scale(1); } to { transform: translate3d(1.5%, -1%, 0) scale(1.08); } } .intro-gate-sky { position: absolute; inset: 0; width: 100%; height: 100%; pointer-events: none; } .intro-gate-bloom { position: absolute; top: 50%; left: 50%; width: 46vmax; height: 46vmax; margin: -23vmax 0 0 -23vmax; border-radius: 50%; background: radial-gradient( closest-side, rgba(255, 255, 255, 0.55), rgba(255, 195, 34, 0.42) 22%, rgba(119, 168, 255, 0.18) 46%, transparent 70% ); opacity: 0; pointer-events: none; } /* -------------------------------------------------------------------------- The lockup: eyebrow, logo, invitation, hint. -------------------------------------------------------------------------- */ .intro-gate-core { position: relative; display: flex; flex-direction: column; align-items: center; gap: 18px; max-width: min(92vw, 560px); padding: 0 20px; text-align: center; pointer-events: none; } .intro-gate-kicker { margin: 0; color: var(--yellow-300); font-size: 11px; font-weight: 500; letter-spacing: 0.24em; text-transform: uppercase; opacity: 0.82; } .intro-gate-logo-wrap { position: relative; display: grid; place-items: center; } /* Warm halo standing in for the hero canvas's golden core mark. */ .intro-gate-logo-wrap::before { position: absolute; top: 50%; left: 50%; width: 132%; aspect-ratio: 1; border-radius: 50%; background: radial-gradient( closest-side, rgba(255, 195, 34, 0.22), rgba(255, 195, 34, 0.06) 55%, transparent 72% ); transform: translate(-50%, -50%); content: ""; pointer-events: none; animation: introCorePulse 3.8s ease-in-out infinite; } /* Matches the existing corePulse values in tsuroya-styles.css. */ @keyframes introCorePulse { 0%, 100% { transform: translate(-50%, -50%) scale(0.9); opacity: 0.45; } 50% { transform: translate(-50%, -50%) scale(1.06); opacity: 0.85; } } .intro-gate-logo { display: block; width: min(58vw, 420px); height: auto; max-height: 34vh; object-fit: contain; } /* The invitation is drawn with the constellation's own line language rather than as a UI control: a spark flanked by hairlines that fade outward, using the exact gold-to-blue stops drawLinks uses on the canvas. Nothing is bordered, filled, blurred, or lifted on hover, so it never reads as a panel sitting on top of the star field. */ .intro-gate-enter { position: relative; isolation: isolate; display: inline-flex; min-height: 48px; align-items: center; gap: 10px; margin: 0; border: 0; border-radius: 0; padding: 12px 8px; background: none; color: var(--yellow-300); font: inherit; font-size: 14px; font-weight: 500; letter-spacing: 0.06em; cursor: pointer; pointer-events: auto; text-shadow: 0 2px 14px rgba(2, 10, 29, 0.85); transition: color 220ms ease; } /* Borderless scrim so passing stars never collide with the glyphs. The radial falloff has no edge, which is the whole point: it darkens the row without drawing a box. The box is kept much larger than the visible reach so the alpha is already at zero where its bounds end. Contained by the isolation above. */ .intro-gate-enter::before { position: absolute; z-index: -1; inset: -54px -56px; background: radial-gradient(46% 62% at 50% 50%, rgba(2, 10, 29, 0.66), rgba(2, 10, 29, 0) 88%); content: ""; pointer-events: none; } .intro-gate-enter-label { white-space: nowrap; } /* Same 8-point geometry as sparkPath on the canvas: outer 50%, inner 0.28 of that at each 45 degree step. Filled with the exact spark colour drawNodes uses, so the glyph and the animated sparks are the same object. */ .intro-gate-spark { width: 11px; height: 11px; flex: 0 0 auto; background: #ffe176; clip-path: polygon(50% 0%, 60% 40%, 100% 50%, 60% 60%, 50% 100%, 40% 60%, 0% 50%, 40% 40%); filter: drop-shadow(0 0 6px rgba(255, 225, 118, 0.6)); animation: introSparkBreath 3.4s ease-in-out infinite; } @keyframes introSparkBreath { 0%, 100% { opacity: 0.78; transform: scale(0.88) rotate(0deg); } 50% { opacity: 1; transform: scale(1.08) rotate(22.5deg); } } /* Hairlines fading outward, gold where they meet the spark, thinning through --blue-300 to nothing. scaleX on hover extends them away from the label. */ .intro-gate-seam { position: relative; width: clamp(26px, 8vw, 118px); height: 1px; flex: 0 0 auto; transition: transform 260ms ease, opacity 260ms ease; } .intro-gate-seam--left { transform-origin: right center; background: linear-gradient(90deg, transparent, rgba(119, 168, 255, 0.18) 42%, rgba(255, 195, 34, 0.5)); } .intro-gate-seam--right { transform-origin: left center; background: linear-gradient(270deg, transparent, rgba(119, 168, 255, 0.18) 42%, rgba(255, 195, 34, 0.5)); } /* A point of light tracing each seam inward, previewing the same travelling dot the exit burst runs down every link. Two keyframe sets, because a percentage translateX would resolve against the 3px dot, not the seam. */ .intro-gate-seam::after { position: absolute; top: 50%; left: 0; width: 3px; height: 3px; margin-top: -1.5px; border-radius: 50%; background: #ffffff; box-shadow: 0 0 6px rgba(119, 168, 255, 0.9); content: ""; opacity: 0; animation: introSeamTrace 5.2s ease-in-out 2200ms infinite; } @keyframes introSeamTrace { 0% { left: 0; opacity: 0; } 12% { opacity: 0.85; } 60% { left: 100%; opacity: 0.85; } 72% { left: 100%; opacity: 0; } 100% { left: 100%; opacity: 0; } } .intro-gate-seam--right::after { left: auto; right: 0; animation-name: introSeamTraceRight; animation-delay: -0.4s; } @keyframes introSeamTraceRight { 0% { right: 0; opacity: 0; } 12% { opacity: 0.85; } 60% { right: 100%; opacity: 0.85; } 72% { right: 100%; opacity: 0; } 100% { right: 100%; opacity: 0; } } .intro-gate-enter:hover { color: #fff3c4; } .intro-gate-enter:hover .intro-gate-seam { transform: scaleX(1.18); opacity: 1; } .intro-gate-enter:hover .intro-gate-spark { filter: drop-shadow(0 0 10px rgba(255, 225, 118, 0.95)); } .intro-gate-enter:active { color: var(--yellow-500); } /* Kept deliberately visible: it only shows for keyboard users, where the affordance outranks staying invisible. The gate focuses this button on load so assistive tech lands inside the dialog, and a ring painted by that programmatic focus would put the box back around the invitation, so the script marks that single focus as quiet. */ .intro-gate-enter:focus-visible:not(.is-quiet-focus) { border-radius: 4px; outline: 1px solid rgba(255, 225, 118, 0.7); outline-offset: 8px; } /* :focus-visible does match that programmatic focus, so the UA's own default ring has to be silenced explicitly as well, or it paints a blue box. */ .intro-gate-enter.is-quiet-focus:focus-visible { outline: none; } /* -------------------------------------------------------------------------- Arrival choreography. Input stays live from frame zero, so an impatient visitor can skip straight past any of this. -------------------------------------------------------------------------- */ html.is-intro .intro-gate-kicker { animation: introRise 900ms cubic-bezier(0.16, 1, 0.3, 1) 150ms both; } /* Focus-pull rather than a plain fade: it is the arrival moment, and it also hides raster softness in the wordmark at large display sizes. */ html.is-intro .intro-gate-logo { animation: introFocusPull 1500ms cubic-bezier(0.16, 1, 0.3, 1) 620ms both; } /* Focus-pull again rather than a rise: the invitation should condense into focus like a star, not slide in like a card. With the instruction line gone this is the closing beat. */ html.is-intro .intro-gate-enter { animation: introFocusPull 1200ms cubic-bezier(0.16, 1, 0.3, 1) 1120ms both; } @keyframes introFocusPull { from { opacity: 0; filter: blur(14px); transform: scale(0.94); } to { opacity: 1; filter: blur(0); transform: scale(1); } } @keyframes introRise { from { opacity: 0; transform: translateY(14px); } to { opacity: 1; transform: translateY(0); } } /* -------------------------------------------------------------------------- Departure: the canvas warps in tsuroya-intro.js while these run alongside. -------------------------------------------------------------------------- */ .intro-gate.is-leaving { will-change: opacity; animation: introFade 900ms ease 620ms both; } @keyframes introFade { to { opacity: 0; } } .intro-gate.is-leaving .intro-gate-core { animation: introCoreOut 820ms cubic-bezier(0.16, 1, 0.3, 1) both; } @keyframes introCoreOut { to { opacity: 0; filter: blur(9px); transform: scale(1.14); } } .intro-gate.is-leaving .intro-gate-bloom { will-change: transform, opacity; animation: introBloom 900ms cubic-bezier(0.16, 1, 0.3, 1) 120ms both; } @keyframes introBloom { 0% { opacity: 0; transform: scale(0.28); } 28% { opacity: 0.92; } 100% { opacity: 0; transform: scale(2.3); } } /* -------------------------------------------------------------------------- Small screens and short viewports -------------------------------------------------------------------------- */ @media (max-width: 760px) { .intro-gate-core { gap: 15px; } .intro-gate-kicker { font-size: 10px; letter-spacing: 0.2em; } /* Kept under the PNG's native width so the wordmark stays crisp at 3x. */ .intro-gate-logo { width: min(70vw, 300px); } .intro-gate-enter { gap: 8px; font-size: 13px; letter-spacing: 0.05em; } .intro-gate-spark { width: 9px; height: 9px; } .intro-gate-seam { width: clamp(18px, 7vw, 56px); } } @media (max-height: 560px) { .intro-gate-core { gap: 12px; } .intro-gate-logo { width: min(46vw, 240px); max-height: 26vh; } .intro-gate-kicker { font-size: 10px; } .intro-gate-seam { width: clamp(18px, 6vw, 72px); } } @media (prefers-reduced-transparency: reduce) { .intro-gate-enter::before { background: radial-gradient(46% 62% at 50% 50%, rgba(2, 10, 29, 0.9), rgba(2, 10, 29, 0) 90%); } } @media (prefers-reduced-motion: reduce) { html.is-intro .intro-gate-kicker, html.is-intro .intro-gate-logo, html.is-intro .intro-gate-enter { opacity: 1; filter: none; transform: none; animation: none; } .intro-gate-nebula, .intro-gate-logo-wrap::before, .intro-gate-spark, .intro-gate-seam::after { animation: none; } .intro-gate-logo-wrap::before { opacity: 0.6; } .intro-gate.is-leaving { animation: introFade 260ms ease both; } .intro-gate.is-leaving .intro-gate-core, .intro-gate.is-leaving .intro-gate-bloom { animation: none; } }